Re: [Discuss-gnuradio] How to save a matrix of integers into a file using GNU Radio

I'm not familiar with python. I've written a C++ block to write integers to a text file. I use fstream.h library. 

Some code in general work function:

std::ofstream fw(d_filename);

      unsigned char *iptr = (unsigned char*)input_items[0];

      if (fw.is_open())

      {

         for(int i = 0; i < noutput_items * d_vlen; i++)

         {

            d_data.push_back (iptr[i]);

            if (((i+1)%10) == 0) fw<<(int) d_data[i]<<std::endl;

            else fw<<(int) d_data[i]<<" ";

         }

          fw.close ();

      }

      else throw std::runtime_error("Error: Can't open file");

When I connect this block directly to one source clock (e.g. Vector Source), this block successfully captures all the input data and write them to text file.

However, when I used this block at the end of a OFDM simulation flow graph, it only wrote very few data to the file though I keep the flow graph running for long time. I printed the input data in Terminal window and see that the data stream still flow continuously.

Hoang Ngo-Khac

Research Assistant - Lab. of Signal and System, FET, UET, Vietnam National University-Hanoi (VNU-H)

Alternative email:  khachoang1412@gmail.com, hoangnk_55@vnu.edu.vn

Mobilephone:  +84.163.682.7874

> Date: Fri, 12 Sep 2014 10:46:32 +0200
> From: martin.braun@ettus.com
> To: discuss-gnuradio@gnu.org
> Subject: Re: [Discuss-gnuradio] How to save a matrix of integers into a file using GNU Radio
>
> In the Python domain, you have lots of tools at your disposal, such as
> Pickle (you can even use scipys io module to write .mat files if you like).
>
> If you are using PMTs, you can use the metadata file sink.
>
> M
>
> On 09/12/2014 09:21 AM, Hoang Ngo-Khac wrote:
> > Dear all,
> >
> > I want to save a matrix of integers into a file, similar to .mat file in
> > MATLAB. To be more specific, my desire block should receive a stream of
> > integers, convert it to MxN matrix and save this matrix so that I can
> > get this data for further process after the flow graph stops.
> >
> > Could you give me some clue to do this in GNU Radio?
> >
> > Thank in advance,
> > Hoang
> >
> > *Hoang Ngo-Khac*
> > Research Assistant - Lab. of Signal and System, FET, UET, Vietnam
> > National University-Hanoi (VNU-H)
> > Alternative email: khachoang1412@gmail.com, hoangnk_55@vnu.edu.vn
> > Mobilephone: +84.163.682.7874
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > Discuss-gnuradio@gnu.org
> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >
>
>
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