shithub: npe

ref: 2565da9396836897b97d335f19f177f993274407
dir: /libnpe/exp2.c/

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#include <math.h>
#include "_npe.h"

double
exp2(double x)
{
	static double ln2c = 0.0;
	if(ln2c == 0.0)
		ln2c = log(2.0);
	return exp(x*ln2c);
}