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Function std.math.operations.fdim

Returns the positive difference between x and y.

real fdim (
  real x,
  real y
) pure nothrow @nogc @safe;

Equivalent to fmax(x-y, 0).


Special Values
x, y fdim(x, y)
x > y x - y
x <= y +0.0


import std.math.traits : isNaN;

writeln(fdim(2.0, 0.0)); // 2.0
writeln(fdim(-2.0, 0.0)); // 0.0
writeln(fdim(real.infinity, 2.0)); // real.infinity
assert(isNaN(fdim(real.nan, 2.0)));
assert(isNaN(fdim(2.0, real.nan)));
assert(isNaN(fdim(real.nan, real.nan)));


Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger


Boost License 1.0.