Low pass filter software?

Question

I\'m looking for digital low pass filter code/library/class for a .net windows forms project, preferably written in c, c++ or c#. I probably need to set the number of poles,

Answer 1

Ok, I found out how to get the coefficients you used. I downloaded Octave for windows and ran the butter command (as in MatLab) like this:

[b,a] = butter(3, .4, 'low')

Now I can use this code with other fs and fc parameters.