I can't afford Matlab right now and so I considered porting the filter design functions to Octave. Got partially through but hung up on the function for estimating the delay of a biquad filter. Anyway...has anyone ported the functions to Octave and used them successfully?
We have a C version of the designer that is in a dev branch now (LGPL license) if its something you wish to try: GitHub - analogdevicesinc/libad9361-iio at filter-designer-standalone
It currently only provides FIR taps, gains, and path rates for a given configuration. If there are other outputs that would be useful let us know.