df

auto df(Vector!(M, T) delegate(in Vector!(N, T)) f, Vector!(N, T) p, E step)
auto
df
(
size_t N
size_t M
T
E = T
)
(
Vector!(M, T) delegate
(
in Vector!(N, T)
)
f
,
in Vector!(N, T) p
,
E step = E.epsilon * 10
)
if (
isFloatingPoint!T &&
isFloatingPoint!E
)
auto df(T delegate(T) f, K p, E step)

Examples

import std.math : sqrt;
auto func( in dvec2 p ) { return dvec3( p.x^^2, sqrt(p.y) * p.x, 3 ); }

auto res = df( &func, dvec2(18,9), 1e-5 );
auto must = Matrix!(3,2,double)( 36, 0, 3, 3, 0, 0 );

assertEqApprox( res.asArray, must.asArray, 1e-5 );

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df