Hi,
I'm pretty new to functional languages but really love Clojure.
My work typically involves multi-dimensional arrays of data. I'm an
oceanographer and typically use things like sea surface height data
from satellite altimetry on 1/3 degree 2D grids with maybe 800 time
slices (=O(5E8 data
Hey Simon,
Incanter is a clojure data processing platform (R-like). http://incanter.org/
It wraps Parallel Colt, a Java matrix math/linear algebra library,
among other things. Parallel colt provides sparse matrices, and I
*guess* they are exposed in the clojure wrapper.
If I wasn't using Incanter (see Alex Robbin's reply), I'd probably just use
a vector of vectors. If your matricies 70% dense, it's generally not worth
it to try and use some sort of sparse data structure- the extra overhead of
the sparse data structure will be greater than the savings of not
On Fri, Oct 28, 2011 at 2:45 PM, Damion Junk jun...@gmail.com wrote:
I have also been using Emacs/Org-mode/Babel/R lately, mostly as a way to
have easily modifiable write up and source code for assignments in
statistics courses. I suppose this is one valid use, but I'm using it less
to
for these cases wouldn't be simpler to paste the map in a string and to create
a function that could parse such a json-compatible map into a clojure map ?
A.
On Dec 20, 2011, at 1:36 PM, Alex Baranosky wrote:
For what it's worth, I think colon's as whitespace in maps adds confusion,
Tamensi movetur! :)
What about integrating the WITH RECURSIVE CTE stuff you've put on
gist?
I've merged it into my (local) fork, modified it slightly to
autodetect the compiler and consider it quite conveniently to use.
I've also added a feature to be able to mark predicate elements as
'inline'
I changed the curl command in the bootstrap script locally to download
r1376 since the day google released it, and I haven't had a problem since.
Not sure if there is an official reason for not switching over yet though.
Jordan
On Tue, Dec 20, 2011 at 9:42 AM, Dave Sann daves...@gmail.com
Hello,
When I have a clojure file with the code as listed below , I get a
compilation error
when I run lein compile whenever the DATABASE_URL is not defined at
compile time.
However I would expect this would be evaluated at runtime.
Is this a bug, or more likely something I don't grasp, can
Thanks for all the replies!
I'm trying midje first (keeping expectations in mind for later) as it seems
to support writing tests and then code (i.e. top down testing).
(This video https://github.com/marick/Midje/wiki/Top-down-testing was
useful, thanks for making it!)
In generating
On Dec 14, 5:33 pm, Tom Faulhaber tomfaulha...@gmail.com wrote:
Razvan,
I believe that proxy actually only creates a new class per call site,
not per instance. However, I can't completely swear to this.
Anyone with more detailed knowledge than I have want to comment?
Assuming I'm right,,
Brian Hurt bhur...@gmail.com writes:
Hi Brian,
Vectors are actually a great trade-off, giving you almost the same
access and memory costs arrays do, but with all the advantages of
being immutable (multi-threaded goodness).
On the other hand, you can have arrays of primitives but no vector of
Pieter Laeremans pie...@laeremans.org writes:
Hi Pieter,
when I run lein compile whenever the DATABASE_URL is not defined at
compile time.
However I would expect this would be evaluated at runtime.
Is this a bug, or more likely something I don't grasp, can someone
point it out for me?
On Thursday, December 22, 2011 3:35:35 PM UTC, Tassilo Horn wrote:
Brian Hurt bhu...@gmail.com writes:
Hi Brian,
Vectors are actually a great trade-off, giving you almost the same
access and memory costs arrays do, but with all the advantages of
being immutable (multi-threaded
Vinzent: apparently, there is a CQL google group, but it seems not to be
public. We're investigating, otherwise creating a new one.
2011/12/21 tscheibl t...@sharkbay.at
What about integrating the WITH RECURSIVE CTE stuff you've put on
gist?
It would certainly be welcome. Though, I'm not
I'm not involved in the development of this client library - I'm just
glad to see it get started. Many thanks to the folks a basho for
considering a Clojure client worthy of being on their roadmap.
https://github.com/reiddraper/sumo
Tim
-Original Message-
From: Reid Draper
Daniel Janus nath...@gmail.com writes:
Hi Daniel,
Vectors are actually a great trade-off, giving you almost the same
access and memory costs arrays do, but with all the advantages of
being immutable (multi-threaded goodness).
On the other hand, you can have arrays of primitives but no
On Tue, 2011-12-20 at 00:26 -0800, Adam Getchell wrote:
On Fri, Oct 28, 2011 at 2:45 PM, Damion Junk jun...@gmail.com wrote:
I have also been using Emacs/Org-mode/Babel/R lately, mostly
as a way to have easily modifiable write up and source code
for assignments in
On Thu, Dec 22, 2011 at 2:54 PM, daly d...@axiom-developer.org wrote:
The combination of literate + TDD seems forbidding.
Are you finding it hard to explain why you wrote a test?
Tim Daly
I decided awhile back when trying to answer questions about literate
programming, that people get
On Thu, 2011-12-22 at 15:35 -0500, Larry Johnson wrote:
On Thu, Dec 22, 2011 at 2:54 PM, daly d...@axiom-developer.org
wrote:
The combination of literate + TDD seems forbidding.
Are you finding it hard to explain why you wrote a
Scheme, for instance, obeys the Law of Macro-Parsimony: don't use
defmacro, namely, where defn will suffice; Clojure, on the other
hand, is macro-liberal.
In other words, everyone seems to prefer e.g. `(defmacro foo [vars
body] `(do ... ~@body))' where `(defn foo [vars thunk] ... (thunk))' would
On Thu, Dec 22, 2011 at 4:54 PM, Peter Danenberg p...@roxygen.org wrote:
Scheme, for instance, obeys the Law of Macro-Parsimony: don't use
defmacro, namely, where defn will suffice; Clojure, on the other
hand, is macro-liberal.
In other words, everyone seems to prefer e.g. `(defmacro foo
On Thu, Dec 22, 2011 at 1:54 PM, Peter Danenberg p...@roxygen.org wrote:
Scheme, for instance, obeys the Law of Macro-Parsimony: don't use
defmacro, namely, where defn will suffice; Clojure, on the other
hand, is macro-liberal.
In other words, everyone seems to prefer e.g. `(defmacro foo
Thanks, Cedric: I suspected that convenience was a primary motivation
(and maybe analogy with `defn', etc.); and I realized that macros can
be more efficient than their equivalent function.
It hadn't occurred to me, though, that a shallow stack might come into
play; or {un,}boxing, of all things.
Quoth Kevin Downey on Sweetmorn, the 64th of The Aftermath:
Why do you care?
SICP-forged neural pathways, basically; I'll end up writing e.g.:
(defn with-input-from-file [file thunk] ...)
only to censor myself: shit, we don't do thunks.
At that point, I'll bust out `defmacro' with
Hi,
passing thunks and macros are not mutually exclusive. with-bindings and
with-bindings* are an example you gave yourself. I often use this style with a
convenience macro and a driver function. Benefits besides the named drawbacks
are reduced code size (depending on number of calls vs. class
Hi!
I have been in the wondrous world of XML-parsing last week and I've found a
missing mechanism in clojure.xml - the escaping the predefined entities:
Example:
(use 'clojure.xml)
(def xmlelem (parse (new org.xml.sax.InputSource (new java.io.StringReader
tag greet=\Clojureamp;co\/ ;;
with-open and with-local-vars couldn't be thunks - the whole point is
creating some lexical variables in the caller's scope. Instead of
(with-open [f (file)] (stuff f)) you could require (open-callback (fn
[f] (stuff f)) (file)): either could expand into something like ((fn
[f] (stuff f)) (file)),
Hi Adam,
It seems like making it so that Marginalia allows you to specify which
directories to use would be the ideal case, instead of feeling a need to
lump all your tests in the src directory.
I wonder if Marginalia already supports this?
Alex
On Wed, Dec 21, 2011 at 11:25 PM, Adam Getchell
On Thu, Dec 22, 2011 at 5:10 PM, Kevin Downey redc...@gmail.com wrote:
fns are not free. every (fn* …) in macroexpanded source results in a new
class.
This is only a problem with respect to load times- clojure tends to make
java's already long load times even longer.
Actual function call
Gah, hit send before I meant to.
On Thu, Dec 22, 2011 at 7:03 PM, Brian Hurt bhur...@gmail.com wrote:
That being said, in defense of functions:
-Many JVMs don't optimize large functions, or optimize them less
aggressively.
So there are reasons to use functions, even functions called via
If you need parsing that is any more complicated, check out
https://github.com/clojure/tools.cli
which handles flags, arguments, and generating --help banners.
On Dec 21, 7:52 pm, Antonio Recio amdx6...@gmail.com wrote:
Solved:
(read-write-image (nth *command-line-args* 0) (nth
Yes, it does. I had problems with some midje-facts crashing the rendering
in marginalia, but was able to just give the files as consecutive arguments
as a work around.
lein marg src/app/core.clj src/app/another/file.clj
wildcards works fine as well.
This problem with midje-facts being
Probably the most effective way to really hammer the benefits of literate
programming into the clojure community would be to take a manageable but
serious and well known clojure program, module, or library, and render it
into literate form. As a clojure programmer, I'm not even there. But as
On Dec 22, 8:52 am, Razvan Rotaru razvan.rot...@gmail.com wrote:
What do you mean by site?
For example, how is it when I'm creating my proxy inside a macro? (and
assuming this macro is called many times)
(defmacro [a-class]
(proxy (a-class) ))
Razvan
Once all code is macroexpanded,
Why should I write English in the first place? Because it helps me to
think; and it helps me to program other people to think like me.
But I would never have learned English unless along the way it gave me
near-term results. It should follow, then, that telling people to
write literate programs
On Dec 22, 5:48 pm, Brian Goslinga brian.gosli...@gmail.com wrote:
On Dec 22, 8:52 am, Razvan Rotaru razvan.rot...@gmail.com wrote: What do
you mean by site?
For example, how is it when I'm creating my proxy inside a macro? (and
assuming this macro is called many times)
(defmacro
Hi,
I want to match vectors of the form [(some expr) :as :label], but #(match
[%] [[expr :as (label :when keyword)]] {:expr expr :label label}) throws a
compiler exception: Unable to resolve symbol expr
How do I do this?
kind regards
--
On Thu, 2011-12-22 at 17:53 -0800, nchurch wrote:
Firstly, there really needs to be something like a Github for literate
programming.
What a great idea!
I'll see what I can do.
Tim Daly
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I'll do everything I can to help. I have tons of thoughts (as you
might guess); but I haven't demonstrated myself to be a great coder,
yet. I feel like I'm a coder who needs something like literate
programming to be great, so it's kind of a chicken-and-egg problem.
I'm already partway there with
While we're on the topic of a literate Github, let me just point out
that we might want to go just a little beyond Github to the way we
write code itself. Look again at the capitalize-every-word function I
defined above. In my original unshortened commentary, I included also
this:
.
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