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authorJoseph Hunkeler <jhunkeler@gmail.com>2015-07-08 20:46:52 -0400
committerJoseph Hunkeler <jhunkeler@gmail.com>2015-07-08 20:46:52 -0400
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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