[Discuss-gnuradio] Working with GRC! Vector decimate

[Glen I Langston]

Hi

Thanks for your help.  I know no-one else cares, but
I’ve finally figured out all the steps to get Vector decimation working with 
GRC.

A few notes:  I don’t think forecast() is ever called with a decimate block.

Multiple output vectors are possible, and care needs to be taken to count
all the outputs. 

My initial QA only had one vector output, so worked fine.
GRC was generating multiple vectors as output and my vave code was chocking
on multiple outputs.

I’ve yet to figure out how to put this block in GitHub

vave.py
Description: Text Data

qa_vave.py
Description: Text Data

vave_vave.xml
Description: application/xml

keep8.grc
Description: Binary data

.  Here
are the bits and pieces.

Best regard

Glen


> On Mar 15, 2018, at 4:32 PM, Müller, Marcus (CEL) <address@hidden> wrote:
> 
> Hi Glen, 
> 
> you can't be a complete failure. Else you wouldn't be part of this
> community :) and you very certainly wouldn't be writing GNU Radio
> blocks after only four weeks!
> 
> Quick look at your work:
> 
>        out = output_items[0]
>        # get the number of input vectors
>        n = len( input_items)
>        print 'Number of work input vectors: ',n
> 
> hey, what's good for output_items is good for input_items, too!
> Point I'm trying to make: "output_items" is in the end a container of
> all output streams; remember, blocks can have multiple output streams.
> You have exactly one, so you take that by saying 
> out = output_items[0]
> 
> Same goes for input_items; you want the first one, so use
> input_items[0] instead of input_items.
> 
> Hope that helps a bit!
> 
> Best regards,
> Marcus
> 
> On Thu, 2018-03-15 at 16:23 -0400, Glen I Langston wrote:
>> Hello GnuRadio fans,
>> 
>> I’m afraid I’m a complete failure at creating my own vector average
>> with decimate block.  This is my 4th week at this endeavor...
>> 
>> I’ve run through a number of c++ and python web examples and each time am 
>> getting
>> hung up somewhere.
>> 
>> I’ve been following the examples from many gnu radio 
>> web sites and trying to get them to complete
>> 
>> Including:
>> https://wiki.gnuradio.org/index.php/OutOfTreeModules
>> 
>> I got the C++ example to work but could not get the python qa test to pass.
>> 
>> In any case, the vector average with decimate must be an easy example
>> but I can not get the qa part to work.
>> 
>> Is there anyone out there who could create the very rudimentary
>> vector average with decimate that they could share?
>> 
>> Please find my code attached.  The python part is simple. 
>> The QA part is not running yet.
>> 
>> I’ve started with:
>> 
>> gr_modtool create vave
>> cd gr-vave
>> gr_modtool add -t decimator -l python vave  
>> 
>> 
>> 
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