#include <math.h>#include "_npe.h" doublelog2(double x){ static double ln2c = 0.0; if(x == 0) return -hugeD; if(x < 0 || isNaN(x)) return NaN(); if(ln2c == 0.0) ln2c = log(2.0); return log(x)/ln2c;} floatlog2f(float x){ if(x == 0) return -hugeF; return log2(x);}
#include <math.h>
#include "_npe.h"
double
log2(double x)
{
static double ln2c = 0.0;
if(x == 0)
return -hugeD;
if(x < 0 || isNaN(x))
return NaN();
if(ln2c == 0.0)
ln2c = log(2.0);
return log(x)/ln2c;
}
float
log2f(float x)
{
if(x == 0)
return -hugeF;
return log2(x);
}