DPLINT(3)

SYNOPSIS
SUBROUTINE DPLINT (N, X, Y, C)

NAME
dplint - Produce the polynomial which interpolates a set of discrete data points.

LIBRARY
SLATEC

CATEGORY
E1B

TYPE
DOUBLE PRECISION (POLINT-S, DPLINT-D)

KEYWORDS
POLYNOMIAL INTERPOLATION

AUTHOR
Huddleston, R. E., (SNLL)

DESCRIPTION
Abstract Subroutine DPLINT is designed to produce the polynomial which interpolates the data (X(I),Y(I)), I=1,...,N. DPLINT sets up information in the array C which can be used by subroutine DPOLVL to evaluate the polynomial and its derivatives and by subroutine DPOLCF to produce the coefficients. Formal Parameters *** All TYPE REAL variables are DOUBLE PRECISION *** N - the number of data points (N .GE. 1) X - the array of abscissas (all of which must be distinct) Y - the array of ordinates C - an array of information used by subroutines ******* Dimensioning Information ******* Arrays X,Y, and C must be dimensioned at least N in the calling program.

REFERENCES
L. F. Shampine, S. M. Davenport and R. E. Huddleston, Curve fitting by polynomials in one variable, Report SLA-74-0270, Sandia Laboratories, June 1974.

ROUTINES CALLED
XERMSG

REVISION HISTORY (YYMMDD)
740601 DATE WRITTEN
891006 Cosmetic changes to prologue. (WRB)
891006 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
900315 CALLs to XERROR changed to CALLs to XERMSG. (THJ)
920501 Reformatted the REFERENCES section. (WRB)