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!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
!                     version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
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!

      SUBROUTINE ZLEGINV(PF,PN,PLEG,DDWT,KTRUNC,KNJ,KLEV 1,1
     S     ,KNJDIM,KLEVDIM,KNDIM)
#if defined (DOC)
*
***s/r ZLEGINV  - Direct Legendre transform restricted to
*     .           fields that vary with latitude only
*
*Author  : P. Gauthier *ARMA/AES  February 1997
*Revision:
*          JM Belanger CMDA/SMC  Aug 2000
*                   . 32 bits conversion
*                    (MXMA8 instead of MXMA)
*     
*          Bin He     *ARMA/MRB*   NOV. 2011. 
*                . Replaced MXMA8 with DGEMUL of ESSL.  
*Arguments
*     o   PF(KNJDIM,KLEVDIM)  : field in physical space
*     i   PN(0:KNDIM, KLEVDIM): spectral coefficients
*     i   PLEG(0:KNDIM,KNJDIM): Legendre functions evaluated at the KNJ Gaussian
*     .                         latitudes
*     i   DDWT(KNJDIM)         : weights of the Gaussian quadrature
*     i   KNJ                 : number of Gaussian latitudes
*     i   KTRUNC              : spectral truncation
*     i   KLEV                : number of fields to transform
*     i   KNJDIM              : dimensioning of the field (in latitude)
*     i   KLEVDIM             : dimensioning of the field (in KLEV)
*     I   KNDIM               : dimensioning of the field (in KTRUNC)
#endif
#include "dgemul.h"
      IMPLICIT NONE
*
*     Arguments
*
      INTEGER KNJ, KLEV, KTRUNC, KNJDIM, KLEVDIM, KNDIM
      REAL*8    PF(KNJDIM,4*KLEVDIM), PN(0:KNDIM, 4*KLEVDIM)
     S     ,  PLEG(0:KNDIM,KNJDIM)
      REAL*8 DDWT(KNJDIM)
*
*     Local variables
*
      INTEGER J, JN, ILEN, IERR
      REAL*8    ZWORK(0:KTRUNC,KNJ)
*RONRON
	call flush(6)
* if knj != knjdim, then the assignment in the following loop may
* be out of bounds for pleg and the dimesions passed to dgemul() as
* the second dimension of zwork (knjdim) is incorrect.
	if (knj > knjdim) then
	  print*, 'ERROR: invalid dimensions in zleginv ',knj,knjdim
	  call abort3d(6,'zleginv')
	endif
*
*
*     1. Prepare the matrix used for the transform
*
      DO J = 1, KNJ
         DO JN = 0,KTRUNC
            ZWORK(JN,J) = PLEG(JN,J)
         END DO
      END DO
*
*     2. Do the transform
*
!      CALL MXMA8(ZWORK(0,1),KTRUNC+1,1,PN(0,1),1,KNDIM+1
!     S     ,PF(1,1),1,KNJDIM,KNJ,KTRUNC+1,KLEV)

       CALL DGEMUL(ZWORK(0,1),KTRUNC+1,'T',PN(0,1),KNDIM+1,'N',
     +    PF(1,1),KNJDIM,KNJ,KTRUNC+1,KLEV) 

*
*
      RETURN
      END