Forum: GNU Radio GNU Radio & GSL

Hi!
I'm trying to do a block for GRC, using some functions availables in 
GSL.
First, I put a example within work function including "#include 
<gsl/gsl_sf_bessel.h>"

***************
int
ocupacion_correlator::general_work (int noutput_items,
                   gr_vector_int &ninput_items,
                   gr_vector_const_void_star &input_items,
                   gr_vector_void_star &output_items)
{
  const float *in = (const float *) input_items[0];
  float *out = (float *) output_items[0];
  float x = 5.0;
  float y = gsl_sf_bessel_J0 (x);
  printf ("J0(%g) = %.18e\n", x, y);
  out[0]=y;
  out[1]=x;

  // Tell runtime system how many input items we consumed on
  // each input stream.
  consume_each (noutput_items);

  // Tell runtime system how many output items we produced.
  return noutput_items;
}
***************

During the exection of cmake, make and make install, I didn't have any 
problem. But, when I execute the flow graph in GRC this error appears:

****************
Traceback (most recent call last):
  File "/home/xuan/Documents/GRC 
generados/probando_correlator_gsl/top_block.py", line 14, in <module>
    import ocupacion
  File "/usr/local/lib/python2.7/dist-packages/ocupacion/__init__.py", 
line 45, in <module>
    from ocupacion_swig import *
  File 
"/usr/local/lib/python2.7/dist-packages/ocupacion/ocupacion_swig.py", 
line 26, in <module>
    _ocupacion_swig = swig_import_helper()
  File 
"/usr/local/lib/python2.7/dist-packages/ocupacion/ocupacion_swig.py", 
line 22, in swig_import_helper
    _mod = imp.load_module('_ocupacion_swig', fp, pathname, description)
ImportError: /usr/local/lib/libgnuradio-ocupacion.so: undefined symbol: 
gsl_sf_bessel_J0
****************

I think I have to make some change on Makefile or a PATH, but I don't 
know how. I installed gsl-bin and libgsl0ldbl packets.

Best Regards.

Adriana A.

Below link might be helpful to you:
http://www.ruby-forum.com/topic/4407135#new



________________________________
 From: Adriana Arteaga <adriarteaga17@hotmail.com>
To: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org>
Sent: Wednesday, November 14, 2012 3:56 PM
Subject: [Discuss-gnuradio] GNU Radio & GSL



Hi!

I'm trying to do a block for GRC, using some functions availables in 
GSL.
First, I put a example within work function including "#include 
<gsl/gsl_sf_bessel.h>"

***************
int
ocupacion_correlator::general_work (int noutput_items,
    gr_vector_int &ninput_items,
    gr_vector_const_void_star &input_items,
    gr_vector_void_star &output_items)
{
 const float *in = (const float *) input_items[0];
 float *out = (float *) output_items[0];
 float x = 5.0;
 float y = gsl_sf_bessel_J0 (x);
 printf ("J0(%g) = %.18e\n", x, y);
 out[0]=y;
 out[1]=x;

 // Tell runtime system how many input items we consumed on
 // each input stream.
 consume_each (noutput_items);

 // Tell runtime system how many output items we produced.
 return noutput_items;
}
***************

During the exection of cmake, make and make install, I didn't have any 
problem. But, when I execute the flow graph in GRC this error appears:

****************
Traceback (most recent call last):
 File "/home/xuan/Documents/GRC 
generados/probando_correlator_gsl/top_block.py", line 14, in <module>
 import ocupacion
 File "/usr/local/lib/python2.7/dist-packages/ocupacion/__init__.py", 
line 45, in <module>
 from ocupacion_swig import *
 File 
"/usr/local/lib/python2.7/dist-packages/ocupacion/ocupacion_swig.py", 
line 26, in <module>
 _ocupacion_swig = swig_import_helper()
 File 
"/usr/local/lib/python2.7/dist-packages/ocupacion/ocupacion_swig.py", 
line 22, in swig_import_helper
 _mod = imp.load_module('_ocupacion_swig', fp, pathname, description)
ImportError: /usr/local/lib/libgnuradio-ocupacion.so: undefined symbol: 
gsl_sf_bessel_J0
****************

I think I have to make some change on Makefile or a PATH, but I don't 
know how. I installed gsl-bin and libgsl0ldbl packets.

Best Regards.

Adriana A.

On 11/14/2012 01:59 PM, Zing Yu wrote:
> Below link might be helpful to you:
> http://www.ruby-forum.com/topic/4407135#new
>
>

gr-wavelet is a good example for this as well.

-josh