## FNiLog2

#### Routine

int FNiLog2 (int N)

#### Purpose

Find the integer greater than or equal to log (base 2) of a given value

#### Description

This function returns the number of bits needed to represent N-1, where N is a given integer value. This routine can be used to find a suitable FFT length (power of two) for a sequence of length N. The FFT length is 2^m, where m is the value returned by this routine. The returned value is smallest m satisfying

      2^m >= N.

#### Parameters

<- int FNiLog2
  Returned integer value
-> int N
  Input value (greater than zero)

#### Author / revision

P. Kabal / Revision 1.7 2003/05/09

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