[SciPy-User] frequency components of a signal buried in a noisy time domain signal

Charles R Harris charlesr.harris@gmail....
Sat Feb 27 15:47:09 CST 2010


On Sat, Feb 27, 2010 at 2:38 PM, <josef.pktd@gmail.com> wrote:

> On Sat, Feb 27, 2010 at 4:14 PM, Ivo Maljevic <ivo.maljevic@gmail.com>
> wrote:
> > -1
> >
> > Which brings up the question: is nextpow2(.5) 0 or -1?
> >
>
> frexp has a discontinuity at zero, same as matlab
> (or is this a computer science definition)
>
> matlab:
> >> nextpow2(0.5)
> ans =
>    -1
> >> nextpow2(0.25)
> ans =
>    -2
> >>
> >> nextpow2(0.125)
> ans =
>    -3
> >> nextpow2(1e-300)
> ans =
>  -996
> >> nextpow2(0)
> ans =
>     0
>
>
Yeah, zero is special, I was thinking -inf, but it's not an integer.

Chuck
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