January 2006 - chuck-users - lists.cs.princeton.edu

standard library documentation updated
by Ge Wang 17 Jan '06

17 Jan '06

Greetings, We have updated the online documentation for the standard libraries, finally adding descriptions to many functions: http://chuck.cs.princeton.edu/doc/program/stdlib.html The changes will also be reflected in the next version of the ChucK manual (pdf). All items on this guide should be present, with the exception of math.pi, math.twopi, and math.e. Please let us know if you find any problems. Best, Ge!

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Question about Gain and instantiating objects
by Mike McGonagle 16 Jan '06

16 Jan '06

Hello All, I have created an object that basically is a simple sine wave grain to be used to create a "cloud" of sound. What I would like to do is to instatiate MANY of these objects, each of which would "exist" for maybe 10 milliseconds, or thereabouts. I was hoping to do this, as I am not really sure exactly how many instances will be needed at a given time. So, I got the object created (in the file 'sinegrain.ck'), and I call its function, sporking it into its own thread. When I create a single object, everything seems to work fine, but when I do more than one, everything goes haywire. I have attached an archive with all the files I use, and you can run them with the following... > chuck sinegrain sgtest1 rec-auto > chuck sinegrain sgtest2 rec-auto > chuck sinegrain sgtest3 rec-auto > chuck sinegrain sgtest4 rec-auto Each of the test files (sgtest...) creates the number of objects that is indicated by the number in the file name. When you run this, you will need to hit control-c to stop everything. The object will produce a print out with the gain of each generator, and once it is finished, it will print "done". You can hit control-c after that... I did this in Pure Data, but I had to create it in such a way that there were already all the generators instantiated, so if there ever occured a moment where one more generator was needed that created, it would "steal" a generator. This occasionally produced some clicks in the resulting sound. Will I need to create an "array" of my objects, creating all the instances that I may need? Or should I be able to create an object, call its function, and call its function by sporking it, and then instatiate a new object using the same object reference? I hope this makes sense, I didn't get much sleep last night, and my brain hurts... Mike

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how to know the input energy??
by Lewis Liu 10 Jan '06

10 Jan '06

Dear Sir, How to get the value of input energy?? Thanks. Lewis

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Math Status
by Mike McGonagle 10 Jan '06

10 Jan '06

I was trying to use the math.pi() and math.twopi() methods, and ChucK complains that these are not members of the library. What is the status of the math library? How complete is it? Thanks, Mike

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Question about Arrays
by Mike McGonagle 09 Jan '06

09 Jan '06

Hello All, I was wondering how I could, once an array has been defined and given a size, how can I recreate this array with a new size as an empty array. Basically, what I am trying to do is to take one array and temporarily store it in another array for later recall. I am creating an object that will extend another, but I want this functionality to reside in the parent object, and the subclasses may have different sizes for these arrays. ******************************* public class BaseClass { float myArray[]; float myStoreArray[]; fun void backUpArray() { myStoreArray[myArray.cap()]; // this is the line in question for (0 => int i; i < myArray.cap(); i++) { myArray[i] => myStoreArray[i]; } } } public class SubClass extends BaseClass { fun void assignMyArray(float a, float b, float c, float d) { [a, b, c, d] @=> myArray; } } public class SubClass2 extends BaseClass { fun void assignMyArray(float x, float y, float z) { [x, y, z] @=> myArray; } } SubClass sub1; SubClass2 sub2; sub1(0.4, 0.6, 1.5, 2.6); sub2(37.2, 23.4, 53.2); sub1.backUpArray(); sub2.backUpArray(); ******************************* I hope this makes sense. Thanks, Mike

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Envelope
by michael breitenbach 09 Jan '06

09 Jan '06

hi, the Envelope UGen has no last() methode ... (instead value() does the same i think) micha

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Any plans for a "Repository"
by Mike McGonagle 06 Jan '06

06 Jan '06

Hello all, Are there any places where people can share their things they produce using ChucK? It would be interesting to hear what others are doing, and possibly learn and build on what others have done? If this is something that is in the works, would this be something where people would submit an MPEG file, or the ChucK source files? One thing that I have done so far was to "translate" some code for doing "Masks" (ala CMask). Plus, I would be interested in sharing my Fractal Classes (once they are in a more complete state). Thanks, Mike

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question about public class
by michael breitenbach 06 Jan '06

06 Jan '06

hi, why doesnt work the following code (bus error on osx): public class wx5 { static Envelope breath; } wx5.breath => blackhole; i want to use the public class for global control variables. the following does the same as the fragment above - but i have to create a dummy object: public class wx5 { static Envelope breath => blackhole; } wx5 dummy; micha

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Is there plans for something like "include"
by Mike McGonagle 05 Jan '06

05 Jan '06

Hello everyone, I was wondering if there were plans to implement a method for "including" a file in another? Something on the order of C's include, or Java's import? Also, if this is not in the plans, then is there anyone who is using something like either "m4" or C's preprocessor to merge file prior to "feeding" ChucK? Is there a way to "pipe" the preprocessed files into ChucK without having to write that stuff to another file? Basically, I have some objects, that I would like to work with accross several files. and rather than having to explicitly put the code into each file. Thanks, Mike

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How to read large data files
by Mike McGonagle 05 Jan '06

05 Jan '06

Hello all, I recently found ChucK, and have started to work with it in putting together some music. I am trying to use fractal data as a control for various parameters. I rewrote my fractal program in ChucK, but because of how the floats are of limited percision, I am getting different results than the same program written in C. I had thought about two (three?) different approaches to solving the problem, the first would be to use my C program to generate the fractal data, and write it to a file. My program can write this data to an audio file, which would then be imported into ChucK. BUT, it would appear that it is not possible to access the underlying sample data from a 'sndbuf' object. I had looked to see if there was a generic function to read raw data from a disk file, but could not find anything. Also, would this be practical to read, as these datafile can have as many as 20,000 samples per file, these into an Array? How much overhead is there in using an array of floating point values on the order of 20,000 elements? The last idea would be to write a UGEN object in C++, and then recompile ChucK to include this new object. Is there a limitation to how many outputs a UGEN can produce in a single iteration? Several of the fractals that I am working with output more than one value per iteration (each output values represents a different variable in the fractal algorithm). Any suggestions would be appreciated. Thanks.

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