CODEWITHSUNDEEP
pythonnumpygnuradio
thewyliestcoyote
thewyliestcoyote

Reputation: 13

GNU Radio filter design tool (gr_filter_design)

I am having some trouble getting the filter design tool to even start. When starting the application I get 

"This example requires a Numerical Python Extension, but
 failed to import either NumPy, or numarray, or Numeric.
 NumPy is available at http://sourceforge.net/projects/numpy".

I have rebuild GNU Radio a couple of times now, and I am fairly sure that I have every thing installed that is required. I do have numpy installed, and I have tried a couple of versions just to be safe.

Has some one else had this problem?

Upvotes: 0

Views: 1982

Answers (3)

remcycles
remcycles

Reputation: 1543

I ran into a similar issue just now, and had to import fftpack from SciPy instead of NumPy. NumPy was still needed for actually generating the filters (removing import numpy would cause gr_filter_design to crash when clicking the "Design" button).

/usr/lib/python3.8/site-packages/gnuradio/filter/filter_design.py:

#    import numpy
#    from numpy.fft import fftpack
#    from scipy import poly1d, signal

    import numpy
    from scipy import fftpack, poly1d, signal

Versions: Manjaro Linux, numpy 1.18.1, scipy 1.4.1, and gnuradio 3.8.0.0.

Upvotes: 0

makomk
makomk

Reputation: 151

If you have a recent version of NumPy installed, you're most likely running into problems because of this line in anynumpy:

from numpy.oldnumeric.compat import *

oldnumeric provided backwards-compatibility support for code written using NumPy's predecessor Numeric, and was removed in NumPy 1.9 which was released at about the time of your question. It looks like the GNU Radio filter design tool simply isn't compatible with NumPy 1.9 right now.

Upvotes: 0

Sreeraj Rajendran
Sreeraj Rajendran

Reputation: 36

You are getting this error as 

from PyQt4.Qwt5.anynumpy import *

in polezero_plot.py (/usr/lib/python2.7/site-packages/gnuradio/filter) is failing.

Just try replacing

from PyQt4.Qwt5.anynumpy import * ( line no 25)

with 

from scipy import zeros

or

from numpy import zeros

Upvotes: 1

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