October 2005 - chuck-users - lists.cs.princeton.edu

system calls
by Graham Percival 06 Oct '05

06 Oct '05

Greetings, ChucK is awesome! I only discovered it slightly a week ago, and I'm a total convert now. I can write programs much more elegantly in chuck than I ever could in pd, and it is _such_ a pleasure to do everything in text. Dev team: you guys rock! I'm working on a chuck->lilypond[1] translator (well, a chuck program that generates lilypond code, gets lilypond to compile it, and then displays the sheet music). I was talking about this with Adam Tindale[2], and he said that ChucK could do system calls. In the source code for chuck, I saw a reference to "std.ck", which is supposed to demonstrate this, but evidently this example file was removed before 1.2 came out. Could anybody shed more light on this? [1] GNU/LilyPond is a notation program that generates beautiful music from (text) input files; I'm their Documentation Editor. http://lilypond.org [2] I'm a music undergraduate student at UVic; Adam is the TA for one of my courses. Ideally I'd like to be able to output strings to a file and run shell commands (ie "lilypond foo.ly" and "open foo.pdf" -- maybe also "ls foo.pdf" to check if lilypond has finished). I could do this in pd via the textedit and "shell" external object, but I'd much much rather use chuck. :) Cheers, - Graham Percival

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No stereo WvOut?
by Tyler Gillies 04 Oct '05

04 Oct '05

ChucKas, I'm running 1.2.0.2-pre and trying to write to stereo WAV file like this: dac => WvOut w => blackhole; "foo.wav" => w.wavFilename; However, foo.wav gets written as a mono file. What to do? Thanks, Tyler Gillies

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compiling chuck for Linux
by Kassen 04 Oct '05

04 Oct '05

ChucKers, I seem to be having a problem trying to compile ChucK for Linux (DeMuDi). I'm fairly certain I installed GCC and G++ correctly since the required Libsndfile library seemed to compile without any obvious complaints. However, when I type "make linux-jack" I get a reply that the command "bison" is not found. I'm not sure what to do about this or where to find "bison". I'm sure this is very stupid question but I'm a bit of Linux n00b. I tried looking in the Faq and so on but no help there. Any pointers would be greatly apreceated. Yours, Kas.

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What does "float Envelope.time" measure?
by Graham Percival 04 Oct '05

04 Oct '05

Greetings, The docs don't say what Envelope.time (from STK) is measured in -- they just says that it's a float. From the code below, I determined that when .target is 0.5, it measures 500::ms (in other words, "2.0 => e.time" takes 1 second to reach the target); when the target is 0.25, it measures 250::ms. Is this proper behavior? I was expecting the time to be... well, more absolute. :) ie 1.0 would mean 1.0 seconds or 1.0 ms. If this _is_ proper behavior, could it be documented? BTW, the example file "sixty.ck" is missing from the 1.2 and 1.2.0.1 source tarballs. Cheers, - Graham Percival ---- envtest.ck 100 => int TIME; sinosc s => Envelope e => dac; 220 => s.freq; 0.5 => e.target; 1.0 => e.time; 0 => int i; while (true) { <<< i*TIME, e.value() >>>; i++; if (e.value() == e.target()) break; TIME::ms=>now; }

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mailing list problem
by Manfred Brockhaus 01 Oct '05

01 Oct '05

I have noticed that sending a reply on this mailing list doesn't work as usual. It seems that by default the reply message is not sent to the list but to the original poster. Can somebody else confirm this problem? -mb

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