Re: [Discuss-gnuradio] Help me help myself

[Marcus D. Leech]

On 12/22/2014 06:37 PM, Richard Bell wrote:
> Hi all,
>
> The goal of this email is to learn how to find answers using available 
> resources on my own in the future. To do this, I will explain what 
> I've done to try and find the answer and then I hope someone can tell 
> me how to finish the process so that next time I can do it on my own.
>
> I'm working through the details of the MM Timing Recovery block. In 
> the process of doing this I've come across the following line in source:
>
> d_omega = d_omega_mid + gr::branchless_clip(d_omega-d_omega_mid, 
> d_omega_lim);
>
> I don't know what gr::branchless_clip does, so I started looking for 
> answers on google and the gnuradio API manual. In the manual, I find this:
>
> http://gnuradio.org/doc/doxygen/namespacegr.html#ace35e8c3e3ad45a5100217d2b6826e1b
>
> but that doesn't tell me what it does. I can't find anymore reference 
> to branchless_clip then this.
>
> From the source code, I don't know how to track down the reference. 
> I've searched my laptop for branchless_clip, but I get no returns.
>
> So the question is, how do I find what branchless_clip does in the MM 
> Timing Recovery block? I care more about the "how do I find" part of 
> the question then the actual answer, though I do want the actual answer.
I used the following "find" command:

find gnuradio -name "*.*" -exec grep -H branchless_clip '{}' ';'

And found the definition in:

gnuradio/gnuradio-runtime/include/gnuradio/math.h:  
branchless_clip(float x, float clip)




--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org