[Discuss-gnuradio] output operand requires a reduction, but reduction is
From:
David Halls
Subject:
[Discuss-gnuradio] output operand requires a reduction, but reduction is not enabled
Date:
Tue, 11 Mar 2014 14:30:24 +0000
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: address@hidden [mailto:address@hidden On Behalf Of Martin Braun
Sent: 11 March 2014 08:33
To: address@hidden
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).
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