C++*********************************************************************
C
C MULFC3.F                         
C
C **********************************************************************
C=*                                                                    *
C=* This file is part of:   SPIDER - Modular Image Processing System.  *
C=* SPIDER System Authors:  Joachim Frank & ArDean Leith               *
C=* Copyright 1985-2010  Health Research Inc.,                         *
C=* Riverview Center, 150 Broadway, Suite 560, Menands, NY 12204.      *
C=* Email: spider@wadsworth.org                                        *
C=*                                                                    *
C=* SPIDER is free software; you can redistribute it and/or            *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* SPIDER is distributed in the hope that it will be useful,          *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* merchantability or fitness for a particular purpose.  See the GNU  *
C=* General Public License for more details.                           *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program. If not, see <http://www.gnu.org/licenses> *
C=*                                                                    *
C **********************************************************************
C
C  MULFC3(LUN1,A1,OUT, H2, NN2,NROW,NSLICE) 
C
C  PARAMETERS:  LUN1      INPUT UNIT FOR CTF FILE              (INPUT)
C               A1        FFT OF INPUT IMAGE                   (INPUT)
C               OUT       =A1 * CONJG(B1)                      (OUTPUT)
C               H2        =H2 + B1^2                           (OUTPUT)
C               NN2       ROW LENGTH                           (INPUT)
C               NROW      IMAGE ROWS                           (INPUT)        
C               NSLICE    VOLUME SLICES                        (INPUT) 
C       
C  OUT = A1 * CONJG(B1)
C  H2  = H2 + B1^2
C
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C--*********************************************************************

        SUBROUTINE MULFC3(LUN1,A1,OUT, H2, NN2,NROW,NSLICE)

        COMPLEX  :: A1(NN2,NROW,NSLICE), OUT(NN2,NROW,NSLICE)
        COMPLEX  :: H2(NN2,NROW,NSLICE)
        COMPLEX  :: B1(NN2)

        DO K=1,NSLICE
          DO J=1,NROW
            NR1 = J+(K-1)*NROW
            CALL REDLIN(LUN1,B1,2*NN2,NR1)

            DO I=1,NN2
               OUT(I,J,K) = OUT(I,J,K) + A1(I,J,K) * CONJG(B1(I))

               H2(I,J,K)  = H2(I,J,K)  + 
     &                      CMPLX(REAL(B1(I) * CONJG(B1(I))), 0.0)
            ENDDO
          ENDDO
        ENDDO

	END