Thanks for the information.  I've been able to find instructions on how to create a hello world C-external but not one that does a simple sinewave equation like A*sin(w*t+p) (https://secure.wikimedia.org/wikipedia/en/wiki/Sine_wave) Does anyone have one or know where to find one.  It makes sense to make a C external and create inputs for the values of frequency,amplitude,phase and vertical offset.  That way I can feed/control those values with a midi controller or a table/array in PureData. 

Thanks 

On Sun, Sep 4, 2011 at 5:35 AM, Hans-Christoph Steiner <hans@at.or.at> wrote:

A .pd file is a text file, so you can just open your Pd patch in a text editor, and paste in the equation.  But honestly with something that big, I think making a C external might be easier in the long run.

.hc

On Sep 4, 2011, at 9:22 AM, Rick T wrote:

Greetings All

I have 2 large equations that I would like to use with the expr command.  Is it possible to import a text file into the expr command?
Here's an example of one of the 2 equations http://dl.dropbox.com/u/6576402/questions/eq1.txt
Basically it's a 1 second periodic signal with sample rate at 44100 which the equation gives me control over the frequency,amplitude,phase and vertical offset

I do have the ability to create a wave (audio) file of the equation first and import the wave file into PureDate, but will I have the same control over the frequency,amplitude,phase and vertical offset that the equation gives me?.

If you want to know what I'm creating.
1) The first option will import a text file into a table/array that will control the variables of the equations that will vary frequency,amplitude,phase and vertical offset over time.  
2) The second option will allow the variables to be controllable/variable using a midi controller and it's audio signal played

I know Puredata can do this very well with small equations and the expr command but using large equations I'm not sure.  Also if I should be doing this in a different way please let me know I'm always willing to learn something new.

Thanks
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