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y = erf(x)
1
),
and
x
is an AD type,
this is an atomic operation
.
0
),
CppAD uses a fast approximation (few numerical operations)
with relative error bound @(@
4 \times 10^{-4}
@)@; see
Vedder, J.D.,
Simple approximations for the error function and its inverse
,
American Journal of Physics,
v 55,
n 8,
1987,
p 762-3.