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

[Karan Talasila]

@Marcus. Instead of using a  grc gui flowgraph to test our block, we have written a qa test code in python which connects vector source, block that we are testing and vector sink just like the example given in out of tree modules to generate square of the input items.

We are writing an alamouti code block which takes in an input stream of N complex numbers and gives out 2 output steams of N items each. I will attach the C++ code of block( http://pastebin.com/Kdnk1t8x )  and also the python qa test code below(http://pastebin.com/da21Ww4B).

On Wed, May 28, 2014 at 2:58 PM, Martin Braun <address@hidden> wrote:

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


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Regards
Karan Talasila