Hi Berkyuim,
I think you mixed up the GNU Radio discuss and the usrp-users mailing
list; I've included the GNU Radio list in my reply, so follow up to that[1]

There is something called function probes in GNU Radio, and it kind of
does what you want, if you want to periodically poll the value of some
function.
However, what you more likely want to do is actually implement some
application logic, and that is usually the point where you start writing
your own blocks in python or C++.

With best regards,
Marcus Müller

[1] if you haven't, sign up at
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

On 30.06.2014 22:46, berkyuim--- via USRP-users wrote:
> Hello,
> I would like to know how to be able to change the value of a variable
> during run time after running gnuradio companion (or the python code
> generated from the gnuradio companion).
> For example,
> Let us say we have UHD source with center frequency of  X Hz, and depending
> on the sum of magnitude square of the IQ samples in a given period, if the
> sum is greater than a threshold, change the frequency to Y Hz, elseleave it
> at X Hz.
>
> Thank you
>
>
>
> _______________________________________________
> USRP-users mailing list
> [email protected]
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

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