From: Ben Reynwar <address@hidden>
To: abdullah unutmaz <address@hidden>; discuss-gnuradio Discussion Group <address@hidden>
Sent:
Friday, August 10, 2012 8:37 PM
Subject: Re: [Discuss-gnuradio] vector sink data
I can't tell what your problem might be without seeing your entire script.
A minimal script doing something like this is:
from gnuradio import gr
tb = gr.top_block()
src = "">snk = gr.vector_sink_f()
tb.connect(src, snk)
tb.run()
print(snk.data())
On Fri, Aug 10, 2012 at 4:05 AM, abdullah unutmaz
<
address@hidden> wrote:
> @Ben, first of all thanks for replying.
>
> I tried both of the solutions, the output I get is a vector containing only
> zeros,
>
> data: (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
>
> When I use probe_signal
>
> data: 0.0
>
> But I was sending a vector composed of eleven elements of a combination of
> ones and zeros. It seems extra-ordinary, when I open
the file to see the
>
data I keep, I see two different symbols, ascii-codes, sequenced
> periodically after skipping an amount of the first stored data.
>
> What may be the problem, any idea?
>
> - Abdullah
>
> ________________________________
> From: Ben Reynwar <
address@hidden>
> To: abdullah unutmaz <
address@hidden>; discuss-gnuradio
> Discussion Group <
address@hidden>
> Sent: Thursday, August 9, 2012 6:29 PM
> Subject: Re: [Discuss-gnuradio] vector sink data
>
> On Thu, Aug 9, 2012 at 1:53 PM, abdullah
unutmaz
> <
address@hidden> wrote:
>> Greetings,
>>
>> I would like to ask you how to read the data stored in a vector sink. I
>> tried the solutions I found in the discussion list. You can see some part
>> of
>> my python code below.
>>
>> ------------------------------------------------------------------------------------------------------------------------------------------------------
>> ##################################################
>> # Connections
>> ##################################################
>> self.connect((self.my_vec_src, 0), (self.my_thro, 0))
>>
vector_source -> throttle
>>
self.connect((self.my_thro, 0), (self.my_h, 0))
>> throttle -> head
>> self.connect((self.my_h, 0), (self.my_vec_snk, 0)) head ->
>> vector_sink
>>
>> time.sleep(10)
>> my_data=self.my_vec_snk.data()
>> print "data: ",my_data
>>
>> --------------------------------------------------------------------------------------------------------------------------------------------------------
>> if __name__ == '__main__':
>> parser = OptionParser(option_class=eng_option, usage="%prog:
>> [options]")
>> (options, args) = parser.parse_args()
>> tb = top_block()
>> tb.Run(True)
>>
>>
----------------------------------------------------------------------------------------------------------------------------------------------------------
>> Output of the program :
>>
>> data: ()
>>
>> I need to read an incoming data to correlate with some predefined data,
>> vector. If I am not wrong the best solution is to save data in a vector
>> sink
>> same length as the predefined vector, then applying the cross-correlation
>> to
>> them. The program above is just a test program to examine what the vector
>> sink
>> stores, but I am confused why it does not work, because I saw a similar
>> working use of a vector sink with USRPs. I already save the data in a
>> file,
>> but it does not seem to me as a good solution at least due to possible
>> memory waste, though clearing the file is possible in
run-time.
>>
>> Thanks in advance,
>> Abdullah
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>>
address@hidden>>
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio>>
>
> vector_sink is useful if you're running for a short time, for example
> in a test. You can access that data using snk.data() after tb.run()
> has completed.
> So something like:
> tb.run()
> time.sleep(10)
> my_data = tb.my_vec_snk.data()
> print "data: ",my_data
>
> To extract data from a running flow graph use the probe blocks
>
(gr.probe_signal_*).
>
tb.start()
> time.sleep(10)
> my_data = tb.my_probe_signal.level()
> print "data: ",my_data
>
>