Define a vector ofdoubleinteger values and calculate the exponents for the next power of 2 higher than those values.

a = [1 -2 3 -4 5 9 519]; p = nextpow2(a)

p =1×70 1 2 2 3 4 10

Calculate the positive next powers of 2.

np2 = 2.^p

np2 =1×71 2 4 4 8 16 1024

Preserve the sign of the original input values.

np2.*sign(a)

ans =1×71 -2 4 -4 8 16 1024

Define a vector of unsigned integers and calculate the exponents for the next power of 2 higher than those values.

a = uint32([1020 4000 32700]); p = nextpow2(a)

p =1x3 uint32 row vector10 12 15

Calculate the next powers of 2 higher than the values ina.

2.^p

ans =1x3 uint32 row vector1024 4096 32768

Use thenextpow2function to increase the performance offftwhen the length of a signal is not a power of 2.

Create a 1-D vector containing 8191 sample values.

rngdefault; x = rand([1,8191]);

Calculate the next power of 2 higher than 8191.

p = nextpow2 (8191);n = 2 ^ p

n = 8192

Pass the signal and the next power of 2 to thefftfunction.

y = fft(x,n);