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.TH FDERIV 3M
.SH NAME
fderiv
.SH DESCRIPTION
subroutine fderiv.f (non-analytical)
source
Bevington, page 242.
purpose
evaluate derivatives of function for least-squares search
for arbitrary function given by functn
usage
call fderiv (x, i, a, deltaa, nterms, deriv)
description of parameters
x - array of data points for independent variable
i - index of data points
a - array of parameters
deltaa - array of parameter increments
nterms - number of parameters
deriv - derivatives of function
subroutines and function subprograms required
functn (x, i, a)
evaluates the fitting function for the ith term
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