df

auto df(Vector!(M, T) delegate(in Vector!(N, T)) f, in Vector!(N, T) p, E step = E.epsilon * 10)
auto df(T delegate(T) f, K p, E step = E.epsilon * 2)
auto
df
(
T
K
E = T
)
(
T delegate(
T
) f
,
K p
,
E step = E.epsilon * 2
)
if (
isFloatingPoint!T &&
isFloatingPoint!E
&&
is(K : T)
)

Examples

auto pow2( double x ){ return x^^2; }
assertEqApprox( df( &pow2,  1 ), 2.0, 2e-6 );
assertEqApprox( df( &pow2,  3 ), 6.0, 2e-6 );
assertEqApprox( df( &pow2, -2 ), -4.0, 2e-6 );

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des math method calculus diff functions

df