[chuck-users] assigning Gen7 coefs

Gregory Brown gwbrown at uga.edu
Mon Mar 30 02:37:40 EDT 2009

```Ah -- an upgrade to the current version solved it. Thanks for taking
a minute to look at it, Tom.

- greg

On Mar 29, 2009, at 11:54 PM, Tom Lieber wrote:

> On Sun, Mar 29, 2009 at 11:50 AM, Gregory Brown <gwbrown at uga.edu>
> wrote:
>> I am trying to use Gen7 for the first time and I am running into
>> trouble
>> assigning the coefficients. The file shown in Example 2 works
>> fine, but
>> Example 1 generates no sound and the lookup gives only NaN. The
>> difference
>> between the two examples is in how I create the coefs array,
>> although I
>> don't see how this affects the outcome.
>>
>> Can someone help me understand what the difference is and why one
>> might work
>> while the other does not?
>>
>> Thanks,
>>
>>  - Greg
>>
>>
>> //+_+_+_+_+_+_+_+_+_+_+_+_+_++_++_+++_+_+
>>
>> //              Example 1
>>
>> //+_+_+_+_+_+_+_+_+_+_+_+_+_++_++_+++_+_+
>>
>> // setup
>> Phasor driver => Gen7 g7 => dac;
>> 220 => driver.freq;
>>
>> // declare array for coefs
>> 5 => float num_values;
>> float coefs[ ((num_values\$int)*2) - 1];
>>
>> // insert random values into every even index
>> for ( 0 => int i; i < num_values ; i++ )
>> {
>>        Std.rand2f(0,1) => coefs[i*2];
>> }
>>
>> // insert time values into every odd index
>> for ( 1 => int i; i < num_values ; i++ )
>> {
>>        1 / num_values => coefs[(i*2)-1];
>> }
>>
>> // print it out
>> for ( 0 => int i; i < coefs.cap() ; i++ )
>> {
>>        <<< "coefs[",i,"]: ", coefs[i] >>>;
>> }
>>
>> // assign the table
>> coefs => g7.coefs;
>>
>> // do a lookup
>> <<< g7.lookup(.5) >>>;
>>
>> // loop
>> while (true)
>> {
>>        100::ms => now;
>> }
>>
>> // +_+_+_+_+_+_+_+_+_+_+_+_+_++_++_+++_+_+
>>
>> //      Example 2
>>
>> //+_+_+_+_+_+_+_+_+_+_+_+_+_++_++_+++_+_+
>>
>>
>> // setup
>> Phasor driver => Gen7 g7 => dac;
>> 220 => driver.freq;
>>
>> // declare array for coefs
>> 5 => float num_values;
>> float coefs[ ((num_values\$int)*2) - 1];
>>
>> // directly assign floats to array
>> [0.709912 , 0.200000 , 0.496574 , 0.200000 , 0.911184 , 0.200000 ,
>> 0.270048
>> , 0.200000 , 0.701863] @=> coefs;
>>
>> // print it out
>> for ( 0 => int i; i < coefs.cap() ; i++ )
>> {
>>        <<< "coefs[",i,"]: ", coefs[i] >>>;
>> }
>>
>> // assign the table
>> coefs => g7.coefs;
>>
>> // do a lookup
>> <<< g7.lookup(.5) >>>;
>>
>> // loop
>> while (true)
>> {
>>        100::ms => now;
>> }
>
> Both work for me.. (miniAudicle, OS X, ChucK 1.2.1.2)
>
> --
> Tom Lieber
> http://AllTom.com/
> _______________________________________________
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> chuck-users at lists.cs.princeton.edu
> https://lists.cs.princeton.edu/mailman/listinfo/chuck-users

```