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Profiling of expanded code?
by David St-Hilaire 16 Nov '08

16 Nov '08

Hi all! I often use Guillaume Germain's profiler for gambit (http://www.iro.umontreal.ca/~germaing/statprof.html) and I would like to know if its possible to get a profiling result on the marco expanded code, and not the source code. I ask this because I wrote several macro which define multiple functions. It seems that lots of the work is done within these functions but the profiler only tells me that it is my macro call who does all the work (but its in fact the code generated by that macro). So having access to a profiling report of the macro expanded code could be usefull :) Thanks! David

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Git mirror
by Nguyen Thai Ngoc Duy 10 Nov '08

10 Nov '08

Hi, I created a Git mirror for Gambit-C at http://repo.or.cz/w/gambit-c.git Now you can clone/update it via git native protocol, which is a bit faster than http. Cheers, -- Duy

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iTunes plugin success.. not so much
by Neil Baylis 09 Nov '08

09 Nov '08

Ah well, egg on face and all that. I've uploaded a new version of my iTunes visualizer with Scheme REPL. The version I uploaded previously was accidentally linked against libgambc.dylib and required that to be in the right place to work. This version is correctly linked against libgambc.a and should work even if you don't have Gambit installed. For anyone interested, you can download scmviz.tar.gz<http://www.pixpopuli.com/Downloads/scmviz.tar.gz> If you download it and unpack the archive, you'll find a README file with instructions. Thanks, and sorry for any inconvenience caused by the faulty version. Neil Baylis

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iTunes plugin success
by Neil Baylis 07 Nov '08

07 Nov '08

Thanks to Marc and others who offered advice, I completed my little project to make an iTunes visualizer plugin with a Scheme REPL. I had previously got it working with Tiny Scheme, but wanted a more robust Scheme implementation, with a compiler. For anyone interested, you can download scmviz.tar.gz<http://www.pixpopuli.com/Downloads/scmviz.tar.gz> If you download it and unpack the archive, you'll find a README file with instructions. >>> Note this currently only supports intel Macs running OSX 10.5 or later. <<< You can play music and watch the pretty pictures, or add your own code in scheme to make it work differently. There's a programming guide along with some sample code to get you started. All you need is a text editor. This is my first project embedding Gambit as a library, and I'm very impressed. It went together with no problems at all. I made a few hooks into the Quartz 2D framework for generating the graphics, but it's not by any means a complete interface. Neil Baylis

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various
by Christoph Bauer 06 Nov '08

06 Nov '08

Hello Experts, my favorite feature of gambit is its portability. It compiles so easily on SunOS, IRIX, AIX, HP-UX and Linux. (Try to find such a common lisp implementation!) So now my questions: - is there a way to copy a record (define-structure) or to convert it to a list, like table-copy and table->list? for tables - there is a function to create symbolic links. Is there also one for readlink(2)? - feature wish: copy-file could be extended to overwrite an existing file. copy-file src dest #!optional force - this code, which is written by Olin Shivers, doesn't work: > (define-syntax let-string-start+end (syntax-rules () ((let-string-start+end (start end) proc s-exp args-exp body ...) (receive (start end) (string-parse-final-start+end proc s-exp args-exp) body ...)) ((let-string-start+end (start end rest) proc s-exp args-exp body ...) (receive (rest start end) (string-parse-start+end proc s-exp args-exp) body ...)))) *** ERROR IN (console)(a)4.17 -- Ill-formed expression Christoph Bauer

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Scheme workshop survey deadline changed to november 2
by Marc Feeley 01 Nov '08

01 Nov '08

The Scheme workshop has been held every year since 2000 (http://www.schemeworkshop.org/ ). It is one of the main venues where the Scheme community can come together to discuss the Scheme programming language. Traditionally the workshop is co-located with the ICFP conference (the only exception is in 2003 when it was held in Boston). The Scheme workshop steering committee (http://www.schemeworkshop.org/sc.html ) which oversees the organization of the workshop is searching for ways to increase the level of participation from the Scheme community. For this reason we are conducting a survey to determine at what location and time the next workshop should be held. One important issue is whether we should continue co-location with the ICFP conference. Please take a few minutes of your time to complete the online survey at the following URL (before the deadline of midnight sunday november 2): http://dynamo.iro.umontreal.ca/sw/survey Your feedback is very much appreciated! Marc Feeley for the Scheme workshop steering committee P.S. My apologies if you get this message multiple times.

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lib/sys.scm seems to be unused holdover
by Christian Jaeger 01 Nov '08

01 Nov '08

It seems lib/sys.scm can be removed? At least Gambit builds and works without it. Christian.

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Table iterators
by David St-Hilaire 01 Nov '08

01 Nov '08

Hi! I just found out that their are the ##table-foldl and ##table-for-each internal procedure that are actually essential for making a program that use table efficient, but why are these only internals, and not external functions? I would have really liked to know about these before now! hehe Thanks David

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(case)
by Christoph Bauer 01 Nov '08

01 Nov '08

thanks for all the responses in the string->number thread. I have another question: what is the correct result of (case ".ab" ((".ab") 1) (else 2)) Indeed gsi gives another answer as scheme48. (maybe eq? vs equal?) Christoph

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Patch to improve elementary functions for complex and exact arguments
by Bradley Lucier 31 Oct '08

31 Oct '08

Marc: Here is a diff containing the following changes to _num.scm: new macros: macro-exp-1/2, macro-exp--1/2, macro-log-2 new function: ##flonum.full-precision, which checks that (abs x) is finite and above the largest subnormal number. In ##log: Define exact-log, which gives a finite answer for extremely large and extremely small exact arguments, and better relative accuracy for exact rationals near 1. It is slower than the old behavior of log on exact rationals near 1, so if you just want a quick and dirty approximation, use (log (exact->inexact x)). Define complex-log-magnitude, which computes (log (magnitude x)) carefully in one step instead of in two steps. in ##atan2: Return exact 0 if x and y are exact, x is positive, and y is 0. Carefully scale arguments before handling off to ##flonum.atan so more answers are finite. Remove some checks, put them in calling functions. in atan: add checks before calling ##atan and ##atan2. in ##sqrt: Define complex-sqrt-magnitude, which carefully calculates (sqrt (magnitude x)) in one step instead of two. For complex arguments, return an exact result where possible, e.g., (##sqrt +2i) => 1+i. I've included a test program below, and the results of that test program in old-results and new-results. Many previous +nan.0 and +inf. 0 results are now finite; finite results that differ in more than the last bit or so have more accuracy. Brad

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