C ++************************************************************************
C
C PICKSV
C
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program 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=* This program 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=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C                                                                          *
C  $$  PICKSV
C
C      PURPOSE: PICKS A X OR Y SLICE OUT OF A 3-D VOLUME FILE
C
C        0         2         3         4         5         6         7
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C **********************************************************************

	SUBROUTINE PICKSV(LUN3,LUN2,NSAM,NROW,NSLICE)

        INCLUDE 'CMBLOCK.INC'
	COMMON BUF(1)

	IF (FCHAR(4:4) .NE. 'X') THEN

          CALL RDPRMI(IROW,IDUM,NOT_USED,'Y-SLICE NUMBER')
          IF (IROW .LE. 0 .OR. IROW .GT. NROW) THEN
            CALL ERRT(24,'PICKSV',NE)
            RETURN
          ENDIF

          DO ISLICE=1,NSLICE
            IRECT = (ISLICE-1)*NROW+IROW
            CALL REDLIN(LUN3,BUF,NSAM,IRECT)
            CALL WRTLIN(LUN2,BUF,NSAM,ISLICE)
          ENDDO

        ELSE

          CALL RDPRMI(ISAM,IDUM,NOT_USED,'X-SLICE NUMBER')
          IF (ISAM .LE. 0 .OR. ISAM .GT. NSAM) THEN
            CALL ERRT(24,'PICKSV',NE)
            RETURN
          ENDIF

          DO ISLICE=1,NSLICE
            IRECT = (ISLICE-1)*NROW
            DO I=1,NROW
              CALL REDLIN(LUN3,BUF,NSAM,IRECT+I)
              BUF(NSAM+I) = BUF(ISAM)
            ENDDO
            CALL WRTLIN(LUN2,BUF(NSAM+1),NROW,ISLICE)
          ENDDO
        ENDIF

	END