FDERIV(3M)

NAME
fderiv

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