SUBROUTINE FD1 (GD1, f, h)
ARGUMENTS
OUT
GD1 result real
IN
F vector of values of the function real
H coordinate differences H(i)=x(i+1)-x(i) i=1,m-1 real
DESCRIPTION
This routine returns one-sided estimate of the derivative at the first point, 4th order accurate.
EXAMPLE
Number 1
Number 2
SEE ALSO
d1, d1int1, d1int2, d1intr, defvec, dn, fdm, int1d1, intrp, intrpr, spd
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