Re: [Discuss-gnuradio] Re: save date and value to an rotating file

[Josh Blum]

> Yes, my application is not complex, but not general. So there is no
> support i think in grc.
> Further on, if you make grc moduls, you have to use the sink and source
> elements from gnuradio and can not process the input data through some
> python functions.
> connect(SOURCE(Gnuradio Source) ---> SINK(Gnuradio Sink))
> Thats it ! No Python between this connection.
>
> It would be nice to make all in GRC, but there is no module in GRC to
> limit the size of an file. Further on i need to save the creation time and the
> finish time of the saved file. This simple task is only be done by
> python or c++.

There is a block called gr.head (misc->head) that shuts-off after N 
samples pass through.

and you can always add custom blocks that you write:
http://gnuradio.org/trac/wiki/GNURadioCompanion#AddingCustomBlocks

> There are many simple function not realized in grc like the 
> mathematical root operation.
>
> Many doesn't work, and so you have to do many by hand !

Anything that you can fit into a line of python is possible, so for 
square root:

1)
x**.5

2)
add an import block: import math
math.sqrt(x)

-Josh