| MATLAB Function Reference | Search Help Desk |
| nextpow2 | Examples See Also |
p=nextpow2(A)
p = nextpow2(A)
returns the smallest power of two that is greater than or equal to the absolute value of A. (That is, p that satisfies 2^p 
abs(A)).
This function is useful for optimizing FFT operations, which are most efficient when sequence length is an exact power of two.
If A is non-scalar, nextpow2 returns the smallest power of two greater than or equal to length(A).
For any integer n in the range from 513 to 1024, nextpow2(n) is 10.
For a 1-by-30 vector A, length(A) is 30 and nextpow2(A) is 5.
fft One-dimensional fast Fourier transform
log2 Base 2 logarithm and dissect floating-point numbers
into exponent and mantissa
pow2 Base 2 power and scale floating-point numbers