Dear Sirs, But, another problem arisen. There is a WX GUI Scope Sink in the middle of the flow-graph to plot the instantaneous reading. When the data stream stop by the Head Block, says, at time=t1, the WX GUI Scope Sink starts to show zero reading.
The question is, how to see the plot between time=0 and time=t1 ? The workaround is to save the data into a file, then plot it using external tool. This is "off-line" approach. Is there any "online" approach that doesn't require any external plotting tool, to view the GUI plot between time=0 and time=t1, after the Head Block terminates the data stream? Regards, activecat On Thu, Jan 30, 2014 at 9:47 PM, Activecat <[email protected]> wrote: > Dear Sirs, > > Thank you very much. > The "head" block solve my problem precisely. > > Note: > The flow graph consists of some other blocks at the middle. > > Regards, > activecat. > > > On Thu, Jan 30, 2014 at 8:18 PM, Marcus Müller <[email protected]> wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> Also, >> to do basic mathematical tasks you don't have to rely on GNU Radio, >> which is a fine signal processing framework but not so much a math >> environment. >> >> If you want to have a three period sine signal, the python is short >> >> #import numpy as np >> >> f_sin = 1.0 >> f_sample = 16.0 >> periods = 3.0 >> >> s_per_period = f_sample/f_sin >> >> sinevalues = np.sin(np.linspace(0, periods*2*np.pi, >> periods*s_per_period) ) >> sinevalues.astype(np.float32).tofile("filename") >> >> this will be the same data format as written by the file sink. >> >> Greetings >> Marcus >> On 30.01.2014 13:02, Felix W. wrote: >> > Hi, >> > >> > you can use a Head block to make the sample stream stop after a >> > given number of samples. Just calculate how many samples there will >> > be in three cycles and set the Head block's parameter accordingly. >> > >> > Greetings Felix >> > >> > >> > 2014-01-30 Activecat <[email protected]>: >> > >> >> Dear Sir, >> >> >> >> A block of Signal Source (Sine) generates sine wave >> >> continuously. How to make it just generates 3 wave-cycle and then >> >> stop generating immediately. At the end of the flow-graph there >> >> is a File Sink. This captures data for offline processing. >> >> >> >> Regards, [email protected] >> >> >> >> >> >> _______________________________________________ Discuss-gnuradio >> >> mailing list [email protected] >> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> >> >> > >> > >> > >> > _______________________________________________ Discuss-gnuradio >> > mailing list [email protected] >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >> -----BEGIN PGP SIGNATURE----- >> Version: GnuPG v1 >> Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ >> >> iQEcBAEBAgAGBQJS6kMXAAoJEAFxB7BbsDrLvCsH/RT3cjGEe+/F/xZKATXhcT/N >> KXTcGJlR3otmGA3EUU79IF7Veel9LFBlhUXIU1OhCPn3n8QpAS0KBzTW5cBatHDb >> HsD+IRZcYN3GkpqYXwpCtaLMNJgDKuHpPXxVwg3CMOXFB6LrJ8eZmB18TGplPv0x >> +N/ijjpRXyFOUwMMyC+vQbGGWkYfEFF3tlwf7Wnt9B5E8+cevVDoTOo4/zGfInv8 >> n6Ww57l7/uxRncBN+eiKdjShWhVD9xKYkonghvJJ05TBRyy4D5IODQJqo8iZlcgA >> 0Q6DHZAPiBgr5rTzbAenHx48RIls7j6+HSEtMDXrHkfRrdOuYxZDgMAh8rDXXgo= >> =j9iF >> -----END PGP SIGNATURE----- >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >
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