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real erf (
) pure nothrow @nogc @safe;
The integral is
erf(x) = 2/ √(π) ∫0x exp( - t2) dt
The magnitude of x is limited to about 106.56 for IEEE 80-bit arithmetic; 1 or -1 is returned outside this range.
Stephen L. Moshier (original C code). Conversion to D by Don Clugston
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