df_scalar

Undocumented in source. Be warned that the author may not have intended to support it.
df_scalar
(
T
K
E = T
)
(
T delegate
(
T
)
f
,
K p
,
E step = E.epsilon * 2
)
if (
isFloatingPoint!T &&
isFloatingPoint!E
&&
is(K : T)
)

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