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Re: [Discuss-gnuradio] Using Function Probe To Get Value From Probe Sign


From: Marcus Müller
Subject: Re: [Discuss-gnuradio] Using Function Probe To Get Value From Probe Signal Vector
Date: Wed, 21 Dec 2016 19:18:54 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0

Hm, yes, for things that move really slowly this of course works – I can't argue with that (nor can I argue with Marcus the First); I'd just argue that the algorithm Sean describes sounds so complicated that intuitively, it sounds like what he'd *like* to have is some DSP on a downsampled version of his signal.

But maybe I should have *asked* about that, before jumping to conclusions; so:

Sean, what is the purposeof this operation? As in: what's the physical meaning of the in- and output of all this?

Best regards,

Marcus


On 21.12.2016 18:55, address@hidden wrote:

Meh, I use function probes to capture 'stuff' that changes slowly--timescales of seconds or tens-of-seconds.

I wouldn't do this for faster stuff, but doing that allows you to use "ordinary" python in a python module, with the probe value as calling parameter.

 

 

 

 

 

On 2016-12-21 11:47, Marcus Müller wrote:

Hi Sean,

you really shouldn't be doing that at all.

If you want to do signal processing, write a simple python block that operates on a sample stream.

The signal probe is really just that, for sporadic "debug" and "display" operation, not for any "useful" application.ö

 

Best regards,

Marcus

 

On 21.12.2016 17:30, Sean Horton wrote:
I have a function probe to get an int from one block's output, and been using a function probe to get the value of the probe signal. I now want to have the block output a vector of ints, and use a probe signal vector to capture them, and nave a few function probes to get index 0, 1, and so forth. How do you do that? It does not seem to be as simple as replacing level with leve[index] (where index is 0, 1, etc) in the function probe's function name field. In my test setup, the function probe never changes from the default value, which is not one of the values in my vector source I'm using for testing. 
 
--
Sean Horton



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