Re: [Discuss-gnuradio] VOLK: fast way to log10()?

[Dennis Glatting]

On Tue, 2015-09-15 at 23:35 -0400, Marcus D. Leech wrote:
> On 09/15/2015 11:15 PM, Dennis Glatting wrote:
> > With the VOLK library, is there a way to compute the log10() of
> > each
> > 32f in a buffer?
> > 
> > That is:
> > 
> >   for( int i = 0; i < num; ++i )
> >     buf[i] = std::log10( buf[i]);
> > 
> > I only see log2() in the library but don't know if there is an easy
> > way
> > to compute log10().
> > 
> > 
> > Thanks.
> Define "fast".
> 

Faster than the code fragment above.

I see log2(), pow(), sin(), and other kernels in the library and
/assumed/ there must be some way of log10() if only through a
combination of kernel calls.


> Ordinarily, one does a log10 to convert into engineering units at the
> back of, for example, a power-measurement chain.
> 
> There's usually no reason to do that in the middle of a flow-graph, 
> where things can stay in linear units.
> 

1) Working with VOLK to learn VOLK.
2) Having fun with vectors.
3) Generating power data points for plotting across a selected 
   set of samples.


> 
> 
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