Re: [Discuss-gnuradio] Transcendental block itemsize mismatch (no custom blocks)

[CEL]

That's a change I can get behind.

On Tue, 2019-10-22 at 15:59 -0700, Martin Braun wrote:
> For your type, try 'complex_float' instead of 'complex_double'. The latter is 
> unfortunately mapped to 'complex' (in the GRC options), which is not a common 
> data type in GNU Radio.
> 
> For 3.9, I would even suggest changing the default from complex_double to 
> complex_float -- if you want to submit a PR, there you go :)
> 
> -- M
> 
> On Thu, Oct 17, 2019 at 2:02 PM Nicholas Bruce <address@hidden> wrote:
> > Hi all,
> > 
> > I am running GNU Radio 3.7.13.4 and working in GNU Radio Companion on 
> > Ubuntu 18.04
> > 
> > I have a very simple flowgraph where I have a source of type complex (I've 
> > tried both a signal source and a constant source) which I connect to a 
> > transcendental block (of type complex) and then output to a sink of type 
> > complex (I don't think anything after the transcendental block matters).
> > 
> > I have tried the transcendental block with functions "sin", "cos" and 
> > "exp". When I execute the flowgraph, I get the error:
> > 
> > ValueError: itemsize mismatch: sig_source_c0:0 using 8, transcendental0:0 
> > using 16
> > The transcendental block is meant to take any cmath functions so I thought 
> > perhaps there were different function names for the complex and float 
> > cases? Something like "ccos" or csin" but I haven't seen any on the list of 
> > available functions.
> > 
> > I have seen similar questions where people are creating custom blocks and 
> > OOT modules and seeing this problem. They have often used the wrong 
> > datatype (numpy complex 32 instead of 64).
> > 
> > I am not using any custom blocks. This problem is with stock/shipped GR 
> > blocks.
> > 
> > Any help is appreciated!
> > 
> > Nick
> > 
> > _______________________________________________
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> 
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