Power Function
The following functions are equivalent to the function gsl_pow_int
(see section Small integer powers) with an error estimate. These functions are
declared in the header file `gsl_sf_pow_int.h'.
- Function: double gsl_sf_pow_int (double x, int n)
-
- Function: int gsl_sf_pow_int_e (double x, int n, gsl_sf_result * result)
-
These routines compute the power x^n for integer n. The
power is computed using the minimum number of multiplications. For
example, x^8 is computed as ((x^2)^2)^2, requiring only 3
multiplications. For reasons of efficiency, these functions do not
check for overflow or underflow conditions.
#include <gsl/gsl_sf_pow_int.h>
/* compute 3.0**12 */
double y = gsl_sf_pow_int(3.0, 12);