!copyright (C) 2001  MSC-RPN COMM  %%%RPNPHY%%%
***FUNCTION TRAPEZ2
*

      REAL FUNCTION TRAPEZ2(DEL,F,N,NM) 5
#include "impnone.cdk"
      INTEGER N, NM, I
      REAL F(N),DEL(NM)
*
*Author
*          L.Garand (1989)
*
*Revision
* 001      G.Pellerin(Mar90)Standard documentation
*
*Object
*          to calculate integrals
*
*Arguments
*
*          - Input -
* DEL      thickness of layers
* F        variable to be integrated
* N        dimension of F
* NM       dimension of DEL
*
**
*
      TRAPEZ2=0.
      DO 10 I=1,NM
  10  TRAPEZ2=TRAPEZ2+(F(I)+F(I+1))/2.*DEL(I)
      RETURN
      END