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Trailing-Edge - PDP-10 Archives - decuslib10-02 - 43,50145/qtfg.doc
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SUBROUTINE QTFG

PURPOSE
   TO COMPUTE THE VECTOR OF INTEGRAL VALUES FOR A GIVEN
   GENERAL TABLE OF ARGUMENT AND FUNCTION VALUES.

USAGE
   CALL QTFG (X,Y,Z,NDIM)

DESCRIPTION OF PARAMETERS
   X	  - THE INPUT VECTOR OF ARGUMENT VALUES.
   Y	  - THE INPUT VECTOR OF FUNCTION VALUES.
   Z	  - THE RESULTING VECTOR OF INTEGRAL VALUES. Z MAY BE
	    IDENTICAL WITH X OR Y.
   NDIM   - THE DIMENSION OF VECTORS X,Y,Z.

REMARKS
   NO ACTION IN CASE NDIM LESS THAN 1.

SUBROUTINES AND FUNCTION SUBPROGRAMS REQUIRED
   NONE

METHOD
   BEGINNING WITH Z(1)=0, EVALUATION OF VECTOR Z IS DONE BY
   MEANS OF TRAPEZOIDAL RULE (SECOND ORDER FORMULA).
   FOR REFERENCE, SEE
   F.B.HILDEBRAND, INTRODUCTION TO NUMERICAL ANALYSIS,
   MCGRAW-HILL, NEW YORK/TORONTO/LONDON, 1956, PP.75.