FDIM(3) Linux Programmer's Manual FDIM(3)
fdim, fdimf, fdiml - positive difference
double fdim(double x, double y);
float fdimf(float x, float y);
long double fdiml(long double x, long double y);
Compile with -std=c99; link with -lm.
These functions return max(x-y,0). If x or y or both are NaN, Nan is
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