[PD] importing / using large equation into expr command

Hans-Christoph Steiner hans at at.or.at
Sun Sep 4 17:35:39 CEST 2011

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.


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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