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Function `std.math.poly`

Evaluate polynomial A(x) = a₀ + a₁x + a₂x² + a₃x³; ...


						
				Unqual!(CommonType!(T1,T2)) poly(T1, T2)
				(
				

				  T1 x,
				

				  in T2[] A
				

				) pure nothrow @nogc @trusted
				

				if (isFloatingPoint!T1 && isFloatingPoint!T2);
				

				

				Unqual!(CommonType!(T1,T2)) poly(T1, T2, int N)
				(
				

				  T1 x,
				

				  const ref T2[N] A
				

				) pure nothrow @nogc @safe
				

				if (isFloatingPoint!T1 && isFloatingPoint!T2 && (N > 0) && (N <= 10));

Uses Horner's rule A(x) = a₀ + x(a₁ + x(a₂ + x(a₃ + ...)))

Parameters

Name	Description
x	the value to evaluate.
A	array of coefficients a₀, a₁, etc.

Example

real x = 3.1L;
static real[] pp = [56.1L, 32.7L, 6];

writeln(poly(x, pp)); // (56.1L + (32.7L + 6.0L * x) * x)

Authors

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

License

Boost License 1.0.