[Discuss-gnuradio] Extracting intermediate data

[Catalin Lacatus]

Hello,

I am working with usrp_spectrum_sense.py and I am trying to analyze the 
intermediate data from different DSP blocks.

After I passed the input stream to a vector I tried to save this information on 
a file like this:



       /s2v = gr.stream_to_vector(gr.sizeof_gr_complex, self.fft_size)

       output2=gr.file_sink(gr.sizeof_gr_complex,"file2.txt")

       self.connect(self.u, s2v, output2)/





and I received the following error:



/node1-2:~/gnuradio/gnuradio-examples/python/usrp# ./usrp_spectrum_sense.py -F 
16 4.5M 7.5M

Using RX d'board A: Basic Rx

Traceback (most recent call last):

 File "./usrp_spectrum_sense.py", line 305, in <module>

   tb = my_top_block()

 File "./usrp_spectrum_sense.py", line 179, in __init__

   self.connect(self.u, s2v, output2)

 File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py", line 
70, in connect

   self._connect(points[i-1], points[i])

 File "/usr/local/lib/python2.5/site-packages/gnuradio/gr/top_block.py", line 
76, in _connect

   dst_block.basic_block(), dst_port)

 File 
"/usr/local/lib/python2.5/site-packages/gnuradio/gr/gnuradio_swig_py_runtime.py",
 line 1469, in connect

   return _gnuradio_swig_py_runtime.gr_top_block_sptr_connect(*args)

ValueError: itemsize mismatch: stream_to_vector(4):0 using 128, file_sink(5):0 
using 8/

/ /



It seems to be a format mismatch.
Please any advice how to write the output of s2v to a file.



Thank you,
Catalin