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C Copyright 1981-2007 ECMWF
C
C Licensed under the GNU Lesser General Public License which
C incorporates the terms and conditions of version 3 of the GNU
C General Public License.
C See LICENSE and gpl-3.0.txt for details.
C
INTEGER FUNCTION IGLREV (PMAT, KCOL, KROW, KDIR, KPR, KERR)
C
C---->
C**** *IGLREV*
C
C PURPOSE
C _______
C
C This routine reverses either the rows or the columns of a
C rectangular matrix.
C
C INTERFACE
C _________
C
C IERR = IGLREV (PMAT, KCOL, KROW, KDIR, KPR, KERR)
C
C Input parameters
C ________________
C
C PMAT - The input matrix of dimension (KCOL, KROW).
C
C KCOL - The length of the first dimension of PMAT.
C
C KROW - The length of the second dimension of PMAT.
C
C KDIR - 1 Reverses the order in each column.
C West-East reversal for meteorological fields.
C 2 Reverses the order in each row.
C North-South reversal for meteorological fields.
C
C KPR - The debug print switch.
C 0 , No debugging output.
C 1 , Produce debugging output.
C
C KERR - The error control flag.
C -ve, No error message. Return error code.
C 0 , Hard failure with error message.
C +ve, Print error message. Return error code.
C
C Output parameters
C ________________
C
C PMAT - The transformed matrix.
C
C Return value
C ____________
C
C The error indicator (INTEGER).
C
C Error and Warning Return Values
C _______________________________
C
C None
C
C Common block usage
C __________________
C
C None
C
C EXTERNALS
C _________
C
C INTLOG - Logs messages.
C
C METHOD
C ______
C
C KDIR = 1 is implemented by swapping elements within each column
C of the matrix.
C
C KDIR = 2 is implemented by reversing the order of the columns.
C
C REFERENCE
C _________
C
C None
C
C COMMENTS
C ________
C
C Program contains sections 0 to 3 and 9
C
C AUTHOR
C ______
C
C K. Fielding *ECMWF* Jan 1994
C
C MODIFICATIONS
C _____________
C
C None
C
C----<
C _______________________________________________________
C
C
C* Section 0. Definition of variables.
C _______________________________________________________
C
C* Prefix conventions for variable names
C
C Logical L (but not LP), global or common.
C O, dummy argument
C G, local variable
C LP, parameter.
C Character C, global or common.
C H, dummy argument
C Y (but not YP), local variable
C YP, parameter.
C Integer M and N, global or common.
C K, dummy argument
C I, local variable
C J (but not JP), loop control
C JP, parameter.
C REAL A to F and Q to X, global or common.
C P (but not PP), dummy argument
C Z, local variable
C PP, parameter.
C
C Implicit statement to force declarations
C
IMPLICIT NONE
C
#include "parim.h"
C
C Dummy arguments
C
INTEGER KCOL, KROW, KDIR, KPR, KERR
C
REAL PMAT (KCOL, KROW)
C
C Local variables
C
INTEGER IHALF
C
INTEGER JSTEP, JMOVE
C
REAL ZTEMP
C
INTEGER JPROUTINE
C
PARAMETER (JPROUTINE = 7300)
C
C External functions
C
C
C _______________________________________________________
C
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGLREV: Section 1.',JPQUIET)
C
IGLREV = 0
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IRSCAN: Input parameters.',JPQUIET)
CALL INTLOG(JP_DEBUG,'IRSCAN: First matrix dimension is ',KCOL)
CALL INTLOG(JP_DEBUG,'IRSCAN: Second matrix dimension is ',KROW)
CALL INTLOG(JP_DEBUG,'IRSCAN: Direction value is ',KDIR)
CALL INTLOG(JP_DEBUG,'IRSCAN: Input parameters.',JPQUIET)
ENDIF
C
C _______________________________________________________
C
C
C* Section 2. Matrix COLUMN reversal (Field row interchange - WE)
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGLREV: Section 2.',JPQUIET)
C
IF (KDIR .EQ. 1) THEN
C
IHALF = KCOL / 2
C
DO 220 JMOVE = 1, IHALF
C
DO 210 JSTEP = 1, KROW
C
ZTEMP = PMAT (KCOL + 1 - JMOVE, JSTEP)
PMAT (KCOL + 1 - JMOVE, JSTEP) = PMAT (JMOVE, JSTEP)
PMAT (JMOVE, JSTEP) = ZTEMP
C
210 CONTINUE
C
220 CONTINUE
C
ELSE
C
C _______________________________________________________
C
C
C* Section 3. Matrix ROW reversal (Field column interchange - NS)
C _______________________________________________________
C
300 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGLREV: Section 3.',JPQUIET)
C
IHALF = KROW / 2
C
DO 320 JMOVE = 1, IHALF
C
DO 310 JSTEP = 1, KCOL
C
ZTEMP = PMAT (JSTEP, KROW + 1 - JMOVE)
PMAT (JSTEP, KROW + 1 - JMOVE) = PMAT (JSTEP, JMOVE)
PMAT (JSTEP, JMOVE) = ZTEMP
C
310 CONTINUE
C
320 CONTINUE
C
ENDIF
C
C _______________________________________________________
C
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
C
IF (KPR .GE. 1) CALL INTLOG(JP_DEBUG,'IGLREV: Section 9.',JPQUIET)
C
RETURN
END
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