Re: [Discuss-gnuradio] Embedded python block in grc will not accept vectors

[Sebastian Koslowski]

Hello Edward,

it seems, vlen support in epy_block was missing. Try this version:

https://github.com/skoslowski/gnuradio/tree/epy_vectors

Let me know if you find any issues.

Sebastian

On 10/10/2016 07:49 PM, Edward Miles wrote:
> Hello, my name is Edward and I have a quick question about the embedded
> python block found in the Misc section of the gnuradio-companion(grc).
> When I go into the block's properties and open its code in the editor I
> want to change this line of code:
> 
> gr.sync_block.__init__(
>             self,
>             name='Embedded Python Block',   # will show up in GRC
>             in_sig=[np.complex64],
>             out_sig=[np.complex64]
>         )
> 
> to this:
> 
> gr.sync_block.__init__(
>             self,
>             name='Embedded Python Block',   # will show up in GRC
>             in_sig=[(np.complex64, 1024)],      # changed to accept a
> vector of size 1024 as its input
>             out_sig=[(np.complex64, 1024)]     # changed to output a
> vector of size 1024
>         )
> 
> This change should allow the block to take in a vector of size 1024 as
> input and also output a vector of size 1024. I've made new modules and
> blocks in python using the gr_modtool and this line of code works fine
> but does not seem to work in the embedded python block in grc. The block
> keeps giving this error:
> 
> Param - Code(_source_code):
> Invalid conversion specification
> 
> I've tried looking into the issue to see if it is just a problem with
> this particular block or if there is a special conversion that needs to
> be done specifically and I can't seem to find anything on it. I could
> just make the block using gr_modtool but it would make life much easier
> if I could implement it with the embedded python block. So my question
> is has anyone else encountered this problem and knows how to get the
> block to accept vectors? Any input would be greatly appreciated. Thank
> you all for your time and consideration.
> 
> 
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