Re: [Discuss-gnuradio] Getting 0, Nan while using usrp2_rx_cfile.py

From the GNURadio Wiki page on Octave:

Data captured directly from the USRP is stored as 32-bit complex, rather than 64-bit complex (gr.sizeof_gr_complex). To read this data, first useread_short_binary() and then split it into a two dimensional vector:

   d=read_short_binary(data);  c=split_vect(d,2); 

This works for both Octave and Matlab.

The value 'NaN' indicates an arithmetic or read error.  You can google it to find more.

http://gnuradio.org/redmine/projects/gnuradio/wiki/Octave

Cheers,

Ben

On Mon, Nov 21, 2011 at 3:28 AM, hasanimam <shuvo1852@gmail.com> wrote:

Hello all,

I have faced another problem here. I am really in great trouble and want
this problem to be solved as early as possible.
I am using the usrp2_rx_cfile.py to get the raw IQ data in usrp2.
I am using the following command
sudo python usrp2_rx_cfile.py -f 800M -N 1000 -d 100 -s -v output.dat

After that, I converted the .dat file using octave command
(read_complex_binary).

However, the values I am getting are ambiguous.
I am getting lots of 0 (zeros) and lots of Nan (dont know what does it mean
though)..I have no idea about it.

Here is the snapshot of what I get. I would really appreciate if somebody
can give any idea about this. Thank you.

------snapshot-----------
(9.183409485952689e-41,0)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,NaN)
 (9.183409485952689e-41,0)
 (NaN,9.183409485952689e-41)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,9.183409485952689e-41)
 (NaN,NaN)
 (9.183409485952689e-41,0)
 (NaN,NaN)
 (0,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (NaN,NaN)
 (NaN,9.183409485952689e-41)
 (0,9.183269356106256e-41)
 (9.183409485952689e-41,9.183409485952689e-41)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,0)
 (9.183409485952689e-41,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)
 (0,0)

--
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