.TH INTERP 3M
.SH NAME
interp
.SH DESCRIPTION
subroutine interp.f 

source
  Bevington, pages 266-267.

purpose
  interpolate between data points to evaluate a function

usage 
  call interp (x, y, npts, nterms, xin, yout) 

description of parameters
  x      - array of data points for independent variable
  y      - array of data points for dependent variable
  npts   - number of pairs of data points
  nterms - number of terms in fitting polynomial
  xin    - input value of x
  yout   - interpolated value of y

subroutines and function subprograms required 
  none

comments
  valid for nterms up to 10
  value of nterms may be modified by the program