Re: [Discuss-gnuradio] FW: using numpy

[Josh Blum]

You need to start the flow graph, let it run for a few 
seconds/milliseconds, then get the data.

Try making these changes:

        import time

        fg = gr.top_block()
        .....
        mult1  = gr.multiply_ff()
        fg.connect(src, (mult1, 0))
        fg.connect(cos_wav, (mult1, 1))

        gate_I = gr.vector_sink_f()
        fg.connect (mult1, gate_I)
        
        fg.start()
        time.sleep(XXX) #enough time to collect data
        fg.stop()

        I_data = numpy.array(gate_I.data())


-Josh

Narayanan, Sivaramasubramanian (R&T) wrote:
> Hi,
>
>         This is a piece of code in my project I need help and
> clarification on.
>
>         fg = gr.flow_graph()
>         .....
>         mult1  = gr.multiply_ff()
>         fg.connect(src, (mult1, 0))
>         fg.connect(cos_wav, (mult1, 1))
>
>         gate_I = gr.vector_sink_f()
>         fg.connect (mult1, gate_I)
>
>         I_data = numpy.array(gate_I.data())
>
> I am using numpy.array to get an array on which I need to do some
> operations like sum() etc. If I am executing this code in the pycrust
> interpreter line by line, I am able to get the data in I_data. But when
> I write the same code in a .py file and execute, I am not getting any
> data.
>
> Even if I copy these set of lines and execute in pycrust using the
> 'paste plus' option, this doesn't workout.
>
> In my code, I need to convert a gr.float vector to an numpy array and
> the  array (or list) back to gr.float vector (using
> gr.vector_source_f()). Please let me know why this problems happen and
> the precautions to be taken while doing such data type conversions.
>
> Thanks a lot.
> Regards,
> N Sivaram
>
>
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