# Gr\_filter\_design issue

**URL:** <https://www.ruby-forum.com/t/gr-filter-design-issue/232752>\
**Category:** GNU Radio\
**Created:** [October 26, 2014, 11:12am UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752 "2014-10-26T11:12:02Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [October 26, 2014, 11:12am UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752/1 "2014-10-26T11:12:02Z")

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Hi,

I just noticed that “gr\_filter\_design” is throwing numpy error and fails  
to  
start (with latest gnuradio-git). I could atleast find one more guy  
complaining about this (

> <https://stackoverflow.com/questions/25882030/gnu-radio-filter-design-tool-gr-filter-design/26142876#26142876>

).

The issue in my case was with

> > from PyQt4.Qwt5.anynumpy import \* (line no 25 in polezero\_plot.py).

Code works fine if I replace the above line with

> > from numpy import zeros  
> > from numpy import float as Float

Anyone else facing the same issue or is this only with my Qt4 package?  
(just launch “filter-design” tool from GRC and try playing with  
pole-zero  
plot)

Thanks  
Sreeraj Rajendran

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**Author:** ![sreeraj\_r](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@sreeraj\_r](https://www.ruby-forum.com/u/sreeraj_r)\
**Post date:** [October 26, 2014, 3:59pm UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752/2 "2014-10-26T15:59:33Z")

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I have same error… I’m using macports GNUradio on OSX 10.10

have’nt tried the ‘from numpy import zeros’ fix

sounds brutal !

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**Author:** ![sreeraj\_r](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@sreeraj\_r](https://www.ruby-forum.com/u/sreeraj_r)\
**Post date:** [October 27, 2014, 2:40pm UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752/3 "2014-10-27T14:40:28Z")

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On Sun, Oct 26, 2014 at 5:10 AM, sreeraj r [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > > from PyQt4.Qwt5.anynumpy import \* (line no 25 in polezero\_plot.py).  
> > > Thanks  
> > > Sreeraj Rajendran

What versions of: QT, QWT, and numpy are you using?

Tom

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**Author:** ![sreeraj\_r](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@sreeraj\_r](https://www.ruby-forum.com/u/sreeraj_r)\
**Post date:** [October 27, 2014, 7:11pm UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752/4 "2014-10-27T19:11:55Z")

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qt4 4.8.6, python2-pyqt4 4.11.2, qwt 6.1.0 and python2-numpy 1.9.0 on  
Archlinux.

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<div class="post-metadata">

**Author:** ![sreeraj\_r](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/3d9bf3/32.png) [@sreeraj\_r](https://www.ruby-forum.com/u/sreeraj_r)\
**Post date:** [November 2, 2014, 4:33pm UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752/5 "2014-11-02T16:33:38Z")

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On Mon, Oct 27, 2014 at 2:10 PM, sreeraj r [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > > I just noticed that “gr\_filter\_design” is throwing numpy error and fails
> > 
> > What versions of: QT, QWT, and numpy are you using?
> > 
> > Tom

Perhaps it’s a change in numpy with version 1.9.0. I can’t look into  
this  
and test it right now, but can you open an Issue on [gnuradio.org](http://gnuradio.org) with  
the  
bug, version information, and your patch to remind us to get to this?  
I’d  
like to just check to make sure your patch is backwards compatible to  
older  
versions of what we support here.

Thanks,  
Tom