Thanks Martin, this is clear and makes sense. I should have read the numpy data types more thoroughly and worked it out. Anyway...
My collaborators are writing their Wireless Network Coding bits in Python. Once I get this block working, I can combined it with the relay work I was doing and we will have a pretty exciting setup to report!! :) I have one more problem though... I have "out_bA1 = output_items[0] ... ...code ... out_bA1[0:len(est_bA1m)] = est_bA1m" where out_bA1.shape = (1,) est_bA1m.shape = (3840,) I get the error " output operand requires a reduction, but reduction is not enabled" *Sometimes* I get out_bA1.shape = (2,) est_bA1m.shape = (3840,) and I get the error "operands could not be broadcast together with shapes (2) (3840)" I wondered if the problem is with 'forecast' (which I have not changed since the template was created by gr_modtool) or having to set_output_multiple? The scheduling aspect of GNU radio seems complex. If I use " out_bA1 = est_bA1m" Then it *runs* OK, but the output of the block i.e. output_items[0] is then no longer altered and 0's are output. Many thanks, David -----Original Message----- From: discuss-gnuradio-bounces+david.halls=toshiba-trel....@gnu.org [mailto:discuss-gnuradio-bounces+david.halls=toshiba-trel....@gnu.org] On Behalf Of Martin Braun Sent: 11 March 2014 08:33 To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Python block, itemsize mismatch On 03/11/2014 02:06 AM, David Halls wrote: > You're a genius! It works. > > Interestingly for a float it requires numpy.float32 or a similar error > occurs. Yes, in GNU Radio we consistently use 32-bit floats. A complex value consists of two of these, hence the 64 bits. Note that this is just for buffers. A lot of blocks use double internally (i.e. 64-bit float, or 128-bit complex) for accuracy reason. However, for signals, it's just a waste of bandwidth (most of time, SNR will trump quantization noise anyway). M _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ________________________________ NOTE: The information in this email and any attachments may be confidential and/or legally privileged. This message may be read, copied and used only by the intended recipient. If you are not the intended recipient, please destroy this message, delete any copies held on your system and notify the sender immediately. Toshiba Research Europe Limited, registered in England and Wales (2519556). Registered Office 208 Cambridge Science Park, Milton Road, Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl --------------------------------------------------------------------------------------- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ---------------------------------------------------------------------------------------
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