FUNCTION D1 (y, h, n)
ARGUMENTS
IN
Y(N) contains N points equally spaced real
H separation real
N dimension of vector Y integer
DESCRIPTION
D1 returns a one-sided estimate of the derivative at the first point, 4-th order accurate.
EXAMPLE
Number 1
SEE ALSO
d1int1, d1int2, d1intr, defvec, dn, fd1, fdm, int1d1, intrp, intrpr, spd
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