Thanks a lot for the help Meikel and Jim.
@ Meikel: it worked great as per your suggestion.
I was just hoping it would be a bit more dynamic and infer the types!!
On May 18, 11:48 pm, Jim - FooBar(); jimpil1...@gmail.com wrote:
Try wrapping your if statement in a let with a binding : [k
Clojure does know the type -- it knows that it is a string, rather than a
number, and it does not support doing arithmetic operations on strings, hence
the error.
Whereas Perl would automatically convert from a string to a number in a case
like this, Clojure does not. One could argue that
I got the error:
*user= (use 'clj-ns-browser.sdoc)
ClassNotFoundException com.fasterxml.jackson.core.JsonFactory*
java.net.URLClassLoader$1.run (URLClassLoader.java:366)
Should I add any jackson dependency? I followed these instructions on
Windows / lein 1.7:
;; Leiningen version 1
Hey Kyle,
I bought this, it looks great. However, browsing around I get a lot of
Sorry, (doc string|Clojure source) not available messages. Was this
intentional? If so, why? If not, will it be fixed sometime soon?
Also, could I ask you a huge, massive favour and make the app universal?
I'd be
Here's a parser: https://github.com/joshua-choi/fnparse
Doesn't look like it's active, but could be a starting point?
- Matt
On Friday, May 18, 2012 8:46:19 AM UTC-4, Alexsandro Soares wrote:
Hi,
I'm trying to build a compiler using Clojure. Is there any tools
like flex and bison
On May 19, 2012, at 3:19 AM, Andy Fingerhut wrote:
Whereas Perl would automatically convert from a string to a number in a case
like this, Clojure does not. One could argue that such auto-conversion of
types, while convenient in many cases in Perl, is also a source of errors in
programs.
Hi Robert,
Thanks for the feedback. Also, thank you for using the app. I'm flattered.
Doc strings and source code are only available (via Clojure for some of the
items). As far as doc strings go, that's a limitation based on whether the
author of the library attached that metadata to their
Awesome, Kyle, thank you. I'm looking forward to the iPad version with
great anticipation!
On 19 May 2012 16:19, Kyle Oba kyle...@gmail.com wrote:
Hi Robert,
Thanks for the feedback. Also, thank you for using the app. I'm
flattered.
Doc strings and source code are only available (via
Why is there this difference in behavior between interactive and
compiled code?
In case you'd wonder why it works at the repl since what we type there are
strings, too. The repl gets them through a call to (read) which parses
strings into data structures that are Clojure code.
This step
On Fri, May 18, 2012 at 8:46 AM, Alexsandro Soares
prof.asoa...@gmail.com wrote:
Hi,
I'm trying to build a compiler using Clojure. Is there any tools
like flex and bison generating Clojure code?
I'm interested in a lexer/parser in pure Clojure because I think
in use the same code
Basic follow up question. I assumed that all facts must be grounded, but I
never really found the answer to this. Is it true?
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They probably should though I don't think that's a hard requirement. In
Prolog you can write a fact that looks like this:
likes(X,X).
To say that everyone likes themselves. This is probably better expressed as
a regular relation in core.logic and not as a fact.
(defn likes [x y]
(== x y))
I'm just getting started with logic programming, and it is entirely
possible I'm just approaching this incorrectly.
Is it possible to use dynamically generated goals in run* ?
For example,
(defrel grade person course g)
(fact grade 'Bob 'Algebra 'B)
(fact grade 'Bob 'Art 'C)
(fact grade 'John
I don't think you need to generate goals for something as straightforward
as this:
(defrel grade person course g)
(fact grade 'Bob 'Algebra 'B)
(fact grade 'Bob 'Art 'C)
(fact grade 'John 'Algebra 'A)
(fact grade 'John 'Art 'A)
(fact grade 'Ricky 'Algebra 'D)
(fact grade 'Ricky 'Art 'A)
(defn
Hmm, I didn't explain it very well. What if I had more knowledge?
Maybe I knew two grades sometimes. That could cut down on the list of
possible students (assuming there are more than the three in my
example).
How could I write a function that worked for both of these cases?
(matches [{:course
Are you trying to see if a person meets multiple requirements? Here's how:
(defrel grade person course g)
(fact grade 'Bob 'Algebra 'B)
(fact grade 'Bob 'Art 'C)
(fact grade 'John 'Algebra 'A)
(fact grade 'John 'Art 'A)
(fact grade 'Ricky 'Algebra 'D)
(fact grade 'Ricky 'Art 'A)
(defn
Oh, so instead of trying to unroll my requirements into a bunch of
conditions, just make a single condition function that checks through
the list. That helps a lot!
Thanks!
Alex
On Sat, May 19, 2012 at 2:11 PM, Jason Jackson jasonj...@gmail.com wrote:
Are you trying to see if a person meets
I wrote a compiler in Clojure for a 4th year course.
For parsing I used this combinator parser
library: https://github.com/jasonjckn/clarsec which is modeled after
haskell's parsec.
However the performance was kind of bad, combinator parsers in general can
be pretty slow.
In retrospect, I
I didn't read the part about clojure/clojurescript interop.
Also, you could write a parser by hand in clojure[script], which takes a
parse table as input. The parse table can be generated with from any
language.
On Saturday, 19 May 2012 15:44:28 UTC-4, Jason Jackson wrote:
I wrote a
I wrote a library on parsing expression grammars (PEGs). Its not completely
independent from clojurescript since I use java's regular expressions for
the token component, but technically it works on sequences and its easy to
rewrite this for js's regexps. Performance hasn't been measured but
That's more or less what I'm going to have to do anyways. It's great that
clojure + core.logic make that as easy as possible.
On Friday, May 18, 2012 10:42:16 PM UTC-4, David Nolen wrote:
It might also be interesting to pursue a hybrid system - that's the whole
point of core.logic - being
I understand how to construct goals using the primitives provided in
core.logic, like a conjunction with fresh or all, and using relations
defined with defrel. However, I don't really understand the protocols of
goals once I no longer use these primitives.
How would I define my own comparison
Such operators are available in core.logic.arithmetic. In general such
operations are non-relational and require projection. cKanren offers a
better story here.
On Saturday, May 19, 2012, Brent Millare wrote:
I understand how to construct goals using the primitives provided in
core.logic, like
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