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

Conversion from ASCII number to string letter
by Andrew C. Smith 16 Oct '10

16 Oct '10

Hey list, Is there a way to convert from a number to a string letter? Here's what I want: 97 => int number; <<< Std.SOMETHING(number) >>>; // console reads: "a" I know that I could create some function in chuck that just returns the ascii string value for all 128 possible numbers...but I don't especially want to. As some background, I'm hacking chuck to get the string.ch(int) method to work, in order to read in some form of notation that's not hard-wired into the code. Let me know if there's an easy way to make this work. Thanks. -Andrew

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Frequency analysis using ChucK
by Sindhuri Kuppasad 16 Oct '10

16 Oct '10

I am an engineering (Computer Science) student and want to develop a *guitar tuning software*. The basic idea is to play a guitar string, read the sound through a microphone, *determine the frequency of the note that was played* and accordingly prompt the user to tune the string up or down. I wanted to know what capabilities ChucK provides to *analyse frequency* of the analog sound input and how it could be used in implementing the guitar tuning application. Also, are there any alternate approaches to obtain the frequency using ChucK? Regards, Sindhuri KN

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Re: [chuck-users] Windows, drives, and Machine.add
by Rebecca Fiebrink 16 Oct '10

16 Oct '10

Thanks, but this doesn't work: ChucK parses this OK but then fails to find the file. Machine.add("/Users/rebecca/tmp.ck") works fine. Machine.add("C\\:/Users/rebecca/tmp.ck") produces [tmp.ck] no such file or directory (And re: previous posts, thanks, but Windows does handle forward-slash-style path names fine, without any need for escape characters. Hence the forward slashes in my strings. Escaped "\\" produces same results. Should've mentioned that before.) Has anyone actually gotten this to work in practice? The source code in chuck-1.2.1.3 that processes the argument to Machine.add is expecting to parse a filename and optional arguments using colons to separate the filename and arguments, but it also looks like it's trying to allow \: to escape a colon. On Fri, Oct 15, 2010 at 10:05 AM, Rebecca Fiebrink <fiebrink at princeton.edu>wrote: > >> Have any ChucK windows users figured out how to accomplish Machine.add >> with a fully-qualified path name that includes the drive letter? >> >> Machine.add("C:/Users/rebecca/tmp.ck") results in error >> "[C]: no such file or directory" > > That happens because the colon is treated the separator between the file name and an argument. and Machine.add("C\:/Users/rebecca/tmp.ck") results in error >> [tmp2.ck]:line(2): unrecognized escape sequence '\:' >> >> That happens, most probably, because the Chuck parser is attempting to translate escape sequences into characters, long before even constructing the call to Machine.add(). Try Machine.add("C\\:/Users/rebecca/tmp.ck") that will let the escape sequence parse parse \\ into \, and then the argument parser will see \: and leave your filename alone. -- rec --

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Windows, drives, and Machine.add
by Rebecca Fiebrink 15 Oct '10

15 Oct '10

Have any ChucK windows users figured out how to accomplish Machine.add with a fully-qualified path name that includes the drive letter? Machine.add("C:/Users/rebecca/tmp.ck") results in error "[C]: no such file or directory" and Machine.add("C\:/Users/rebecca/tmp.ck") results in error [tmp2.ck]:line(2): unrecognized escape sequence '\:' I know you can leave off the C: entirely and it will work, but my concern is the situation where different files to be added live on different drives. Thoughts? Thanks! Rebecca

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Hello, some newbie questions
by Mat Schaffer 08 Oct '10

08 Oct '10

Hello everyone, I've been playing with chuck for a couple weeks and am having a lot of fun with it. Really cool environment and I was impressed how easy it was to set up the MIDI stuff. After reading over a lot of material though, I still couldn't answer a few questions, so I thought I'd try the list. - Is there any way to have a script load it's own dependencies? I tried Machine.add which is listed on http://github.com/heuermh/lick/wiki, but it doesn't seem to work. Here's the code I'm trying: http://gist.github.com/611486 - Similar to the last question, when I do load both of the above files into chuck at once, it seems like only the class ends up in the global space. Is there any way share raw functions or variables between files? The reason I want to do this is mostly to avoid having to do timing code like this http://gist.github.com/611515, or note definitions (cs, Cs) in every file. Something like a pre-processor include would probably do the trick. - Is there a way to pass functions as arguments to another function or return a function? Also, are fun's proper closures or am I just getting lucky? I was thinking maybe I could use functional style programming to build things like arpeggiations. If this is totally overkill let me know :) - The SinOsc seems to click whenever I stop or disconnect it. I've tried moving the gain to 0.1, then 0, but it still seems to click. Is there some technique for avoiding this? Thanks in advance for your help. Looking forward to spending more time with ChucK in the future. -Mat

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chuck + jack multiple outputs
by Thomas Girod 07 Oct '10

07 Oct '10

hello there I would like to run chuck with more than two outputs in jack (linux). To do so, I'm using the following command: > chuck --loop --out8 unfortunately, this command fails with: > [chuck]: (via rtaudio): no devices found for given stream parameters: > ... RtApiJack: the Jack server does not support requested channels! it looks like chuck automatically connects to the soundcard inputs and outputs - and if there are not enough I/O ports on the soundcard, it fails. Is there a way to start chuck without connecting inputs and outputs ? tom

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broken inheritance ?
by Thomas Girod 07 Oct '10

07 Oct '10

hi. I'm facing a weird issue with inheritance. here is a bit of code : http://pastebin.com/rGFx6pus I have a Handler class that defines a listen() method, and several classes inheriting from Handler. Then, when I try to call bpm.listen(orec) on line 10, it says "class BpmHandler has no member listen" - even though it should access the one from the Handler class. Any clue ? And by the way, I was wondering: Handler @ h; new BpmHandler @=> h; this won't work, even though it is legit from a OOP inheritance point of view. is it deliberate, or something on the todo list of the dev team ? cheers tom

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snd file writing
by Daniel Trueman 01 Oct '10

01 Oct '10

hey, anyone ever do any writing of soundfiles to disc? i can't seem to make SndBuf or WvOut do it.... dt

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continuous random values
by Thomas Girod 28 Sep '10

28 Sep '10

Hi there. I am looking for some kind of "random lfo" to change a parameter continuously and randomly. I remember there is a UGen called "LFNoise2" to do that in SuperCollider. How can I do that with ChucK ? thanks tom

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good until loop
by Timothy Leonido 28 Sep '10

28 Sep '10

Would anyone mind sending a good example for loop "until" ? I simply want a shred to stop automatically after a 10 seconds. Here is what I wrote: do{ Std.rand2f(200,50.0) + Math.sin(v*100.0)*20.0 => v2 => f.pfreq; Std.rand2f(5000.0, 60) + Math.sin(v*30.0)*80.0 => f3.pfreq; Std.rand2f(1500, 80.0) + Math.sin(v*200.0)*50.0 => f2.pfreq; std.rand2f(.551,.549)=>buf.rate; .0+(.9*maybe)=>buf.gain; 0=>buf.pos; .1:: T =>now; } until (5::second); thanks so much! -tim

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