obspy.signal.util.next_pow_2

[Khalilsqu]

I am just wondering does the function obspy.signal.util.next_pow_2 is same as matlab function nextpow2?

matlab
nextpow2(18000) = 15

obspy
obspy.signal.util.next_pow_2(18000)= 32768 = 2**15

[krischer]

Yep. Only that matlab returns the exponent whereas ObsPy return the actual number.

[ogalanis]

Technically, the matlab function returns the exponent of the next
power of 2 and the obspy function returns the actual next power of 2.
So,

(obspy next power of two) = 2 ^ (matlab next power of two)
or
(matlab next power of two) = log2 (obspy next power of two)

Παραθέτοντας από Khalil Al Hooti [e-mail]:

I am just wondering does the function obspy.signal.util.next_pow_2
is same as matlab function nextpow2?

matlab
nextpow2(18000) = 15

obspy
obspy.signal.util.next_pow_2(18000)= 32768

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[ThomasLecocq]

just to say, with the new scipy.fftpack since 0.18, next_fast_len is a product of 1s, 3s and 5s, faster and more stable than powers of 2...