Clojure.java.jdbc alias
I'm working with leiningen for the first time and trying to use clojure.java.jdbc. All the docs I see use 'sql' before the jdbc commands. How do I set up the sql symbol. Nothing I've tried seems to work. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Books on Java Objects and Primitives
I think I understand what you're looking for. I have the same concern. There very best Java book I have found is The Java Developer's Almanac by Patrick Chan. Volume 2 covers Swing and Volume 1 covers everything else. No nonsense, just answers with great examples. Bill On May 23, 12:16 pm, octopusgrabbus octopusgrab...@gmail.com wrote: I apologize for not being clearer in why I asked this question. While learning Clojure, I thought it would be helpful to have some Java objects/primitives documentation to know what I can call in Clojure. Thanks and sorry for the too brief original post. On May 23, 10:01 am, octopusgrabbus octopusgrab...@gmail.com wrote: What are some recent books that cover Java objects and primitives? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Strange error
Can anyone help me with this? I get the following error: Exception in thread main java.lang.IllegalArgumentException: Parameter declaration dosync should be a vector (jjJack.clj:22) Line 22 is the ns statement - no other error line in my program is listed. I've used dosync many times. Every one here looks correct. No parens are off. Where should I look? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure Editor
Bluefish does not work that way.It will indent to the last
indentation in all cases. I've never used EMacs, but all the editors
I've ever used work indenting the same way. All I can suggest is
that you ask the Bluefish users group if there is a way to do what you
want.
On Mar 16, 9:16 am, Lee Spector lspec...@hampshire.edu wrote:
I have Smart auto indenting on in the preferences, and the language is set
to Clojure, but I don't see any smarts. If I type:
(defn foo
and hit return the cursor goes to the beginning of the next line, not
indented. If I hit the tab key it tabs in, but it'll tab anything in further
each time I hit tab; it's not sensitive to the syntax or at least it's not
going to a reasonable place for the syntax. Within a definition if I type:
(cons (first x)
and hit return the cursor goes beneath the first (, not beneath the second
( (which is the behavior of emacs modes, which I prefer) or even under the
o (which is the current behavior of Counterclockwise). Again, I can move
things around with tab but it's not syntax aware.
I've tried doing this in parentheses-balanced expressions as well, but still
no smarts. I use this feature not only to keep my code neat but also to make
syntax errors visually obvious; it won't help for this if the indentation
isn't automatically aware of the language's syntax.
What am I missing?
Thanks,
-Lee
On Mar 16, 2011, at 8:38 AM, WoodHacker wrote: Check preferences from the
toolbar or the Bluefish dropdown. There
are checks for Smart Auto Indenting and Highlighting block
delimiters. There's very little this editor doesn't do. You just
have to make sure all the checks you want are set.
Bill
On Mar 14, 10:06 pm, Lee Spector lspec...@hampshire.edu wrote:
The Clojure mode activates for me, and I get a little bit syntax coloring,
autocompletion, and () matching. But I don't get language aware
indentation. Should I, or isn't this supported? (It's a really important
feature IMHO.) Also, no matching of [] or {} (less important for me).
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Re: Clojure Editor
Check preferences from the toolbar or the Bluefish dropdown.There
are checks for Smart Auto Indenting and Highlighting block
delimiters.There's very little this editor doesn't do.You just
have to make sure all the checks you want are set.
Bill
On Mar 14, 10:06 pm, Lee Spector lspec...@hampshire.edu wrote:
The Clojure mode activates for me, and I get a little bit syntax coloring,
autocompletion, and () matching. But I don't get language aware indentation.
Should I, or isn't this supported? (It's a really important feature IMHO.)
Also, no matching of [] or {} (less important for me).
Thanks,
-Lee
On Mar 14, 2011, at 8:06 AM, WoodHacker wrote: The file you need should be
there. First look under the Document/
Language Support menu item. You should see and entry for Clojure.
Try checking it. The syntax file is called clojure.bflang2 and it
should be in a Bluefish directory somewhere on your system. I am
using a MAC, so the file is under the /Applicatiions directory. If
you need to adjust the bflang2 file for some reason, the file that
explains how to do it is Sample.bflang2. If none of this makes
sense and you can't find clojure.bflang2, try contacting the Bluefish
people by sending and email to bluefish-us...@lists.ems.ru.
On Mar 13, 9:49 am, Shantanu Kumar kumar.shant...@gmail.com wrote:
Do I need a plugin? I downloaded the stock 2.0.3-1 version of the
editor and it doesn't even seem to syntax-highlight the Clojure code.
Regards,
Shantanu
On Mar 13, 5:09 pm, WoodHacker ramsa...@comcast.net wrote: If you are
looking for a very good editor for Clojure try Bluefish.
It's been around for ever, is very stable, and does everything you
would want an editor to do. And it now works with Clojure.
http://bluefish.openoffice.nl
Bill
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Re: Clojure Editor
The file you need should be there. First look under the Document/ Language Support menu item. You should see and entry for Clojure. Try checking it.The syntax file is called clojure.bflang2 and it should be in a Bluefish directory somewhere on your system. I am using a MAC, so the file is under the /Applicatiions directory.If you need to adjust the bflang2 file for some reason, the file that explains how to do it is Sample.bflang2.If none of this makes sense and you can't find clojure.bflang2, try contacting the Bluefish people by sending and email to bluefish-us...@lists.ems.ru. On Mar 13, 9:49 am, Shantanu Kumar kumar.shant...@gmail.com wrote: Do I need a plugin? I downloaded the stock 2.0.3-1 version of the editor and it doesn't even seem to syntax-highlight the Clojure code. Regards, Shantanu On Mar 13, 5:09 pm, WoodHacker ramsa...@comcast.net wrote: If you are looking for a very good editor for Clojure try Bluefish. It's been around for ever, is very stable, and does everything you would want an editor to do. And it now works with Clojure. http://bluefish.openoffice.nl Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Clojure Editor
If you are looking for a very good editor for Clojure try Bluefish. It's been around for ever, is very stable, and does everything you would want an editor to do. And it now works with Clojure. http://bluefish.openoffice.nl Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Reference Variables Question
Hi, I have a simple general question about variables used in Clojure. Often you have an object that must be referenced because it is established at run time and not known beforehand. Lets say we have an block object and it has a certain height. We create a reference to the block's height and use it throughout the program. But there are many cases where we have to know HALF the height of the block. My question is, is it more efficient to create another reference for half the block's height or to calculate the half height value every time it is needed? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Help with Java arrays
Hi, I'm trying to get the midi sound class in Java to work in Clojure. Everything seems to work fine except for the conversion of the following Java code: MidiChannel[] channels = synthesizer.getChannels; I've tried just dumping the channels into a Clojure object - (let [channels (.getChannels @synthesizer)] but I get the following error: Exception in thread main java.lang.IllegalArgumentException: Can't call public method of non-public class: public javax.sound.midi.MidiChannel[] com.sun.media.sound.AbstractPlayer.getChannels() There seems to be no way to find out how many channels there are beforehand. I'm sure there's a solution, but I can't figure it out. Any ideas? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Map keys
Is it possible to create a map key from an integer or string to be used for retrieving data dynamically from a map? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Help with java conversion
I'm converting the java code examples in Killer Game Programming in
Java by Andrew Davison to Clojure and am having great fun doing it.
But I've hit wall where I can't seem to get the code to work.
The following code moves an animated gif strip to a java array:
public BufferedImage[] loadStripImageArray(String fnm, int number)
{
if (number = 0) {
System.out.println(number = 0; returning null);
return null;
}
BufferedImage stripIm;
if ((stripIm = loadImage(fnm)) == null) {
System.out.println(Returning null);
return null;
}
int imWidth = (int) stripIm.getWidth() / number;
int height = stripIm.getHeight();
int transparency = stripIm.getColorModel().getTransparency();
BufferedImage[] strip = new BufferedImage[number];
Graphics2D stripGC;
// each BufferedImage from the strip file is stored in strip[]
for (int i=0; i number; i++) {
strip[i] = gc.createCompatibleImage(imWidth, height,
transparency); =
// create a graphics context
stripGC = strip[i].createGraphics();
=
// stripGC.setComposite(AlphaComposite.Src);
// copy image
stripGC.drawImage(stripIm,
0,0, imWidth,height,
i*imWidth,0, (i*imWidth)+imWidth,height,
null);
stripGC.dispose();
}
return strip;
} // end of loadStripImageArray()
The problem I'm having is with the for loop. If I create an abject
array of say 6 buffered images, how do I reference the indexed image
array to match the lines pointed to? In other words what is the
equivalent of strip[i] in Clojure?
I'm not exactly a beginner, but this has stumped me.
Bill
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Re: Multidimensional Float arrays
This is a much better solution. It's shorter and is easier to read. Thanks for tip! Bill On Jan 10, 11:49 pm, Sunil S Nandihalli sunil.nandiha...@gmail.com wrote: Hi Bill , the following is one way of doing it .. (into-array (map float-array [[1.0 1.0 2.0 2.0] [3.0 2.2 4.0 0.0]])) Sunil. On Mon, Jan 10, 2011 at 8:32 PM, WoodHacker ramsa...@comcast.net wrote: Hi, Can anybody explain to me how to create a multidimensional array of floats such as: [[1.0 1.0 2.0 2.0] [3.0 2.2 4.0 0.0]] Anything I try gives me errors. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.comclojure%2bunsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Multidimensional Float arrays
When all else fails, read the directions. Thanks for the help. On Jan 10, 4:44 pm, Ken Wesson kwess...@gmail.com wrote: On Mon, Jan 10, 2011 at 4:40 PM, WoodHacker ramsa...@comcast.net wrote: The question was how to place data in the array, not create it. I've been doing that. How do you populate it? The doc shows: user= (doc aset-float) - clojure.core/aset-float ([array idx val] [array idx idx2 idxv]) If I try that I get: user= (def wa (make-array Float/TYPE 4 4)) #'user/wa user= wa #float[][] [...@4cb533b8 user= (aset-float wa 0 0 1.0) java.lang.Exception: Unable to resolve symbol: in this context (NO_SOURCE_FILE:5) user= What am I missing? That that's not a literal ampersand expected by aset-float; just that it can take a variable number of indices. Try (aset-float wa 0 0 1.0). -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Multidimensional Float arrays
Hi, Can anybody explain to me how to create a multidimensional array of floats such as: [[1.0 1.0 2.0 2.0] [3.0 2.2 4.0 0.0]] Anything I try gives me errors. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Multidimensional Float arrays
The question was how to place data in the array, not create it. I've been doing that. How do you populate it?The doc shows: user= (doc aset-float) - clojure.core/aset-float ([array idx val] [array idx idx2 idxv]) If I try that I get: user= (def wa (make-array Float/TYPE 4 4)) #'user/wa user= wa #float[][] [...@4cb533b8 user= (aset-float wa 0 0 1.0) java.lang.Exception: Unable to resolve symbol: in this context (NO_SOURCE_FILE:5) user= What am I missing? On Jan 10, 10:08 am, Albert Cardona sapri...@gmail.com wrote: 2011/1/10 WoodHacker ramsa...@comcast.net: Hi, Can anybody explain to me how to create a multidimensional array of floats such as: [[1.0 1.0 2.0 2.0] [3.0 2.2 4.0 0.0]] Anything I try gives me errors. user= (doc make-array) - clojure.core/make-array ([type len] [type dim more-dims]) Creates and returns an array of instances of the specified class of the specified dimension(s). Note that a class object is required. Class objects can be obtained by using their imported or fully-qualified name. Class objects for the primitive types can be obtained using, e.g., Integer/TYPE. nil user= (make-array Double/TYPE 2 8) #double[][] [...@4cb533b8 user= (count (aget *1 0)) 8 --http://albert.rierol.net -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Multiple Files
Hi all, Can anyone help me with this? I have a program with multiple files. The program uses various data references, which may be accessed from different files. To facilitate this I usually put ref variables in a separate file and then :use that file in all the various modules that make up the program. That has worked perfectly - except for on problem.I cannot seem to get defrecord to work in the same way. If I put a defrecord description in my refs file I get the following error: Exception in thread main java.lang.IllegalArgumentException: Unable to resolve classname: phone-data The question is: Why doesn't this work? And how do I get around it?Do I put the defrecord in each file it's to be used in? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Handling keystrokes
This is a Clojure Java interop problem.If you are doing GUI programming with Swing in Clojure this is a real problem. The question is how do you subclass (?) a built-in swing operation to extend it to include your own code.After the paste, I want to do something to the pasted text.This is done all the time, but I have no idea how to do it in Clojure. Bill On Sep 30, 8:16 am, Laurent PETIT laurent.pe...@gmail.com wrote: You have probably mistaken this clojure group for another ... 2010/9/30 WoodHacker ramsa...@comcast.net I have a keyboard paste problem, but I think it has more general interest. When the user types Control V in a JTextPane, data from the clipboard will be pasted into the text. I want to act on that pasted text. I can easily capture the keystroke. The problem is that my capture takes place BEFORE the actual paste. What do I do to make my handler occur AFTER the paste? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.comclojure%2bunsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Handling keystrokes
I have a keyboard paste problem, but I think it has more general interest. When the user types Control V in a JTextPane, data from the clipboard will be pasted into the text. I want to act on that pasted text. I can easily capture the keystroke. The problem is that my capture takes place BEFORE the actual paste. What do I do to make my handler occur AFTER the paste? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Dynamic defrecord
Hi Stu It is as simple as that. What I'm really working on is my own editor. The file in question is the lexer for various program types.The editor never knows what type of file will be loaded until it's loaded. At that point the proper lexer should be loaded and stored so that the next time a file of that type is loaded the lexer is already there.This problem is seen in many different programming tasks.There is no point in pre-loading a ruby lexer if the user never loads a ruby file, etc.Once loaded the lexer is never changed. I like slurp as the function name! Bill On Jul 28, 9:16 am, Stuart Halloway stuart.hallo...@gmail.com wrote: Hi Bill, Are your looking for something as simple as this: (defrecord Foo [x]) (defn load-a-record-at-runtime Loads a record value from a file [f] (Foo. (slurp f))) Or is there some subtlety here? Stu The confusion over type and instance was a sloppy example. Sorry. But in your solution I'm confused by one thing. You create and instance of Foo in the let and then assoc the new value of List1 to it. This has two problems. One is that the loaded data is not permanent. The other is that there is no way to add List2 to the MyFoo record. (I've decided to not use MyFoo at all. Instead I have a (def List1 (ref nil)) defined and then do a ref-set to it when the data is loaded. This seems much simpler and works. I then can do a def for List2, List3, etc.) It seem to me there should be some way to load a record at run time without breaking the immutability laws. Once the dynamic data is loaded, the record becomes immutable and will never be changed again. It's unrealistic to imagine that we always know at compile time what the values of a record will be. I'm not a compiler person so I have no idea how to do such a thing and no idea if it is possible. On Jul 27, 5:23 pm, Stuart Halloway stuart.hallo...@gmail.com wrote: Hi Bill, There are several issues here: (1) A confusion of record and instance. You are asking for the :list1 field from foo, the record type, not from an instance of the type. (:list1 foo) s/b (:list1 MyFoo) (2) You are ignoring the return value of assoc. Remember, Clojure data structures are immutable. To actually assign something you need to hold on to the return value of the expression (or use a reference type if you really want an identity). (3) The capitalization choices facilitate confusion. You are using foo for a record/class name, where both Java and Clojure style would dictate Foo. Then you use MyFoo for a top-level def, where Clojure style would encourage my-foo. The following code demonstrates these ideas. ;; stubbed so example can be run (defn load-data-from-file [x] :stub) (defrecord Foo [list1 list2]) (defn get-data [path] (let [list1Data (load-data-from-file path) f (Foo. nil nil) f (assoc f :list1 list1Data)] (:list1 f))) (get-data fakepath) Regards, Stu Stuart Halloway Clojure/corehttp://clojure.com All the examples of defrecord I see seem simple enough and when I experiment in the REPL I get things to work as they should. However, when I move to 'real' code I can't get it to work at all. The problem at hand is simple enough - I want to create a record that hold records. For example I have (defrecord foo [list1, list2]) where list1 and list2 are defined records themselves. The issue is that the data in list1 and list2 is dynamic - it is loaded from a file at run time. So I do the following: (def MyFoo (foo. nil nil)) (defn get-data [path] (let [list1Data (load-data-from-file path)] ; fill in the record for list 1 (assoc MyFoo :list1 list1Data) ; assign the data record to the foo record (:list1 foo) )) As I say, if I do this non-dynamically in the REPL I get the proper result. In my program (using let) (:list1 foo) always remains nil. What am I doing wrong? And how can I get the fields of foo to take on the dynamic data. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at
Re: Dynamic defrecord
Yes, but I don't want to load all the parts at once. I may have four records that will be part of MyFoo, but I only ever need one - maybe List3 in this case.That's why it's dynamic and why I have the problem in the first place. Bill On Jul 28, 12:40 pm, Armando Blancas armando_blan...@yahoo.com wrote: It seem to me there should be some way to load a record at run time without breaking the immutability laws. Once the dynamic data is loaded, the record becomes immutable and will never be changed again. Actually, that's how records work and is exactly the behavior of the initial (foo. nil nil), after which the record is loaded and immutable. If the loaded data must be bound to MyFoo: (def MyFoo (foo. (load-data-from-file f1) (load-data-from-file f2))) or you might consider making Myfoo a ref instead of each subrecords, seems simpler that way. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Dynamic defrecord
The confusion over type and instance was a sloppy example. Sorry. But in your solution I'm confused by one thing. You create and instance of Foo in the let and then assoc the new value of List1 to it. This has two problems. One is that the loaded data is not permanent. The other is that there is no way to add List2 to the MyFoo record. (I've decided to not use MyFoo at all. Instead I have a (def List1 (ref nil)) defined and then do a ref-set to it when the data is loaded.This seems much simpler and works. I then can do a def for List2, List3, etc.) It seem to me there should be some way to load a record at run time without breaking the immutability laws.Once the dynamic data is loaded, the record becomes immutable and will never be changed again.It's unrealistic to imagine that we always know at compile time what the values of a record will be. I'm not a compiler person so I have no idea how to do such a thing and no idea if it is possible. On Jul 27, 5:23 pm, Stuart Halloway stuart.hallo...@gmail.com wrote: Hi Bill, There are several issues here: (1) A confusion of record and instance. You are asking for the :list1 field from foo, the record type, not from an instance of the type. (:list1 foo) s/b (:list1 MyFoo) (2) You are ignoring the return value of assoc. Remember, Clojure data structures are immutable. To actually assign something you need to hold on to the return value of the expression (or use a reference type if you really want an identity). (3) The capitalization choices facilitate confusion. You are using foo for a record/class name, where both Java and Clojure style would dictate Foo. Then you use MyFoo for a top-level def, where Clojure style would encourage my-foo. The following code demonstrates these ideas. ;; stubbed so example can be run (defn load-data-from-file [x] :stub) (defrecord Foo [list1 list2]) (defn get-data [path] (let [list1Data (load-data-from-file path) f (Foo. nil nil) f (assoc f :list1 list1Data)] (:list1 f))) (get-data fakepath) Regards, Stu Stuart Halloway Clojure/corehttp://clojure.com All the examples of defrecord I see seem simple enough and when I experiment in the REPL I get things to work as they should. However, when I move to 'real' code I can't get it to work at all. The problem at hand is simple enough - I want to create a record that hold records. For example I have (defrecord foo [list1, list2]) where list1 and list2 are defined records themselves. The issue is that the data in list1 and list2 is dynamic - it is loaded from a file at run time. So I do the following: (def MyFoo (foo. nil nil)) (defn get-data [path] (let [list1Data (load-data-from-file path)] ; fill in the record for list 1 (assoc MyFoo :list1 list1Data) ; assign the data record to the foo record (:list1 foo) )) As I say, if I do this non-dynamically in the REPL I get the proper result. In my program (using let) (:list1 foo) always remains nil. What am I doing wrong? And how can I get the fields of foo to take on the dynamic data. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Dynamic defrecord
All the examples of defrecord I see seem simple enough and when I experiment in the REPL I get things to work as they should. However, when I move to 'real' code I can't get it to work at all. The problem at hand is simple enough - I want to create a record that hold records. For example I have (defrecord foo [list1, list2]) where list1 and list2 are defined records themselves. The issue is that the data in list1 and list2 is dynamic - it is loaded from a file at run time.So I do the following: (def MyFoo (foo. nil nil)) (defn get-data [path] (let [list1Data (load-data-from-file path)] ; fill in the record for list 1 (assoc MyFoo :list1 list1Data) ; assign the data record to the foo record (:list1 foo) )) As I say, if I do this non-dynamically in the REPL I get the proper result. In my program (using let) (:list1 foo) always remains nil.What am I doing wrong? And how can I get the fields of foo to take on the dynamic data. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Clojure's n00b attraction problem
So I wonder how much making the first few baby steps easier is really going to help the uptake of Clojure. I have to imagine that the kind of person that can't figure out a CLASSPATH is going to have his head explode when he has to figure out how to restructure all his iterations in terms of loop/recur. This discussion, although interesting, is ridiculous.I've been doing this for nearly 40 years and if I'd listened to all the people who worried that new languages were to hard for noobs, I'd still be writing Fortran or Cobal.C was hard when it first came out - for most of the same reasons people are using with Clojure.Clojure is a great language now and can only get better because it mixes the greatest language ever invented (Lisp) with the best library available.People have complained for years about the limitations of Lisp, but it's still with us (whatever happened to PL1?)All Lisp has ever needed was a universal library. Let the faint of heart turn away - they will come back. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: How to reset a counter
On May 29, 9:44 am, James Reeves jree...@weavejester.com wrote: On 29 May 2010 14:19, WoodHacker ramsa...@comcast.net wrote: I'm working on a simple imaging problem. I want to copy an array of pixels to an image buffer. That means that I have to deal both with an array and a matrix (x and y). As I go along my array, each time x reaches the end of a line in the matrix I have to set it back to zero and increment y. I can find no simple way to do this without getting a compile error. Can someone show me how to do this? (dotimes [k 256] (write-buffer (mod k 16) (quot k 16) (value 16))) James, Thanks. I have written code in about every mainstream language. None of them have this power (except Lisp). Two lines? Amazing. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
How to reset a counter
I've been working with Lisp and Scheme for the past few years and have
migrated to Clojure because of the JVM. I think I get functional
programming, but one problem is giving me fits.
I'm working on a simple imaging problem. I want to copy an array of
pixels to an image buffer. That means that I have to deal both with
an array and a matrix (x and y). As I go along my array, each time x
reaches the end of a line in the matrix I have to set it back to zero
and increment y.
I can find no simple way to do this without getting a compile error.
Can someone show me how to do this?
Example in pseudo code:
x = 0
y = 0
for (k = 0; k 256; ++k)
if (= x 16) {
x = 0
(inc y)
}
else
(inc x)
writeBuffer (x, y, value[k])
Bill
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Testing equality
Can someone explain to me why this doesn't work: (let [ p Bill/ sep (System/getProperty file.separator) ] (if (= (last p) sep) (println found separator) (println no separator) ) The (= (last p) sep) always returns false. If I print them out inside pipes they look like | / | and | / | (white space on either side of the slash). Is this some sort of bug? Is there a better solution for finding a file separator at the end of a line? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
Re: Nubie Question
I thank all the people who have sent me solutions to my Conj problem. Unfortunately, none of them seem to work. The issue is adding a value to a defined vector - (def savedColors [black, white]) One solution was given as: (swap! savedColors conj newcolor) This produces still the following runtime error: Exception in thread AWT-EventQueue-0 java.lang.ClassCastException: clojure.lang.PersistentVector cannot be cast to clojure.lang.Atom Another solution was to make savedColors an atom - (def savedColors (atom [black, white])) This produces a new compile error: Exception in thread AWT-EventQueue-0 java.lang.IllegalArgumentException: Don't know how to create ISeq from: clojure.lang.Atom Changing savedColors to a list instead of a vector gets the same error. The atom example on the web is for a map. I'm sure this can be done. So far I just don't know how. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
Re: Nubie Question
Actually, swap! doesn't seem to work in my case.I should state what I'm trying to do.I'm writing a graphics editing program where I want the user to be able to choose and save color values. I start out with a vector containing blank and white. When the user selects a new color and wants to save it I add the new color to the vector. (def savedColors [black, white]) . (defn saveColor [color panel] (swap! savedColors (conj savedColors color)) -- this does not work . also show the colors in the editor )) I get the following error: Exception in thread AWT-EventQueue-0 java.lang.ClassCastException: clojure.lang.PersistentVector cannot be cast to clojure.lang.Atom I assume I'm using swap! correctly, but may not be. Bill On Mar 23, 9:57 am, Per Vognsen per.vogn...@gmail.com wrote: By definition, persistent data structures are never mutable. But there are various kinds of mutable references (vars, refs, atoms, agents) that can _refer_ to persistent (hence unchanging) data structures. While David has given you an answer to your immediate query, I would ask you to step back and consider whether you're sure you really need references. You haven't supplied enough context for us to make that call. -Per On Tue, Mar 23, 2010 at 8:35 PM, WoodHacker ramsa...@comcast.net wrote: I understand howconjworks. But how do you add a value to a persistent vector? You have to add the new item to the vector with (conjvector item), but how do you assign the return value to the persistent vector. So far I have it working with a def -- (def vector (conjvector item)) -- but I'm not sure this is 'pure' Clojure. Is there a better way, functionally, or am I there? Functional programming is the best way to go, but very few programs can exist without mutable persistent data. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
Nubie Question
I understand how conj works.But how do you add a value to a persistent vector?You have to add the new item to the vector with (conj vector item), but how do you assign the return value to the persistent vector. So far I have it working with a def -- (def vector (conj vector item)) -- but I'm not sure this is 'pure' Clojure.Is there a better way, functionally, or am I there? Functional programming is the best way to go, but very few programs can exist without mutable persistent data. Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
JColorChooser
When I try to use JColorChooser in Clojure I get the followinf error: Exception in thread AWT-EventQueue-0 java.lang.IllegalArgumentException: No matching method found: showDialog for class javax.swing.JColorChooser Shouldn't showDioalog be there? What and I doing wrong. Here's the code: (defn newColor [parent] (proxy [ActionListener] [] (actionPerformed [evt] (def colorChooser (new JColorChooser)) (doto colorChooser (.showDialog parent Choose Color bisque)) ))) Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en To unsubscribe from this group, send email to clojure+unsubscribegooglegroups.com or reply to this email with the words REMOVE ME as the subject.
Menubar presentation on a Mac
Hi All, Can anyone explain how I can get a traditional Mac OS menubar to appear at the top of the screen? Normally I would use (System/setProperty apple.laf.useScreenMenuBar, true) and then (.setJMenuBar ...) in my main frame. This does not appear to work. The menu shows up in the frame itself as in Windows and the Apple menu shows only clojure.main. I am running my program as a script - java -cp .:$CLOJURE_HOME/ clojure.jar clojure.main dicon.clj and not compiling it into Java classes.Since I am calling clojure.main from my script it seems to be taking over the menubar. Is there a way around this? Bill -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
