Sorry, just to clarify, I get that error unless I fill output_items completely, no matter the length of x. Thanks, Anisha
On Thu, Jul 19, 2012 at 3:00 PM, Anisha Gorur <at...@virginia.edu> wrote: > I was trying that earlier, however, I get this error from my code > output_items[0][:] = x #where x equals a numpy.complex64 array with a > length of 32 > > ValueError: operands could not be broadcast together with shapes (4096) > (32) > > > On Thu, Jul 19, 2012 at 2:44 PM, Josh Blum <j...@ettus.com> wrote: > >> >> >> On 07/19/2012 11:28 AM, Anisha Gorur wrote: >> > It works now, thanks! It was a combination of a couple dumb errors on my >> > part. One last thing, I was wondering if there was a way to change the >> > length of output_items[0]? It is 4096 by default I believe. >> > Thanks, >> > Anisha >> >> The item length is basically randomly decided by the scheduler. However, >> you call set_output_multiple(x) and you will be guaranteed to get x*N >> items where N is an integer. Also, you dont have to actually fill all >> items, just fill the number you plan to produce. >> >> -josh >> >> > >> > On Thu, Jul 19, 2012 at 2:13 PM, Josh Blum <j...@ettus.com> wrote: >> > >> >> >> >> >> >> On 07/18/2012 11:32 AM, Anisha Gorur wrote: >> >>> Hello All, >> >>> >> >>> I've been attempting to create my own source block in Python. I have >> been >> >>> reading the blocks coding guide here: >> >>> >> >> >> https://github.com/guruofquality/grextras/wiki/Blocks-Coding-Guide#wiki-work-operation-modes >> >> , >> >>> but so far my source only outputs zeros. >> >>> An outline of my code is as follows: >> >>> >> >>> class constSource(gr.block): >> >>> def __init__(self): >> >>> gr.block.__init__(self, name = "signal source", >> in_sig = >> >>> None,out_sig = [numpy.complex64]) >> >>> >> >>> def work(self, input_items, output_items): >> >>> num_output_items = len(output_items[0]) >> >>> >> >>> #I put the code to create what I want to stream here, the >> code >> >>> creates a numpy.complex64 array with a length of 32. I then return >> >>> num_output_items >> >> >> >> >> >> You didnt include the code, but I am guessing that you are not >> assigning >> >> anything to the output vector? >> >> >> >> numpy array assignment look like this >> >> output_items[0][some kind of index selection] = data >> >> >> >> Look closely at how the examples do this >> >> >> >> -josh >> >> >> >>> return num_output_items >> >>> >> >>> I then write my constSource block to a file and I try to see the >> output >> >> of >> >>> the file using a scope sink, but it is just a constant stream of >> zeros. >> >> Am >> >> >> >> >> >> _______________________________________________ >> >> Discuss-gnuradio mailing list >> >> Discuss-gnuradio@gnu.org >> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> > >> > >> > >> >> > > > -- > Anisha Gorur > Class of 2012 > Electrical Engineering > > -- Anisha Gorur Class of 2012 Electrical Engineering
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