Re: [Discuss-gnuradio] assertion error beyond 4096 output items

[Martin Braun]

On 28.05.2014 11:13, Martin Braun wrote:
> On 28.05.2014 09:45, Karan Talasila wrote:
> > Hi
> >      we have written a c++ block using out of tree modules which uses a
> > sync block that outputs same no of items as input items given. we have
> > written a python test file where the inputs and outputs are complex
> > floats. The test code is running well until 4096  items. But when the
> > output items size is greater than or equal to 8192, ctest shows  an
> > assertion error which says
> >
> > -10+5j !=10+5j beyond 7 places.
>
> This looks like floating point quantization errors. Show us your QA, and
> make sure you're using the assertFloatTuplesAlmostEqual (not sure if
> that's the right name) call.

Ah, as Marcus M points out, this is a signature error, rather than 
quantization :)
Still, this all points to your code being incorrect, or your QA making 
invalid assumptions.

Maybe you should be tracking state in your block (these number indicate 
that more than 1 work function call seem unveil your bug).

M