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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 IGNORM (PWFACT, PSUM, KOWE, KONS, KPR, KERR)
C
C---->
C**** *IGNORM*
C
C PURPOSE
C _______
C
C Normalise the array of interpolation weights.
C
C INTERFACE
C _________
C
C IERR = IGNORM (PWFACT, PSUM, KOWE, KONS, KPR, KERR)
C
C Input parameters
C ________________
C
C PWFACT - The array of unnormalised interpolating weights to
C the four neighbouring points for every output point.
C
C PSUM - Work array used to aid vectorisation.
C
C KOWE - The number of points in the West-East direction in
C the output field.
C
C KONS - The number of points in the North-South direction
C in the output field.
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 PWFACT - The normalised array of interpolating weights to
C the four neighbouring points for every output point.
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(R) - Logs messages.
C
C METHOD
C ______
C
C The four weights for each output point are normalised to have a
C sum of one.
C
C REFERENCE
C _________
C
C None
C
C COMMENTS
C ________
C
C Program contains sections 0 to 2 and 9
C
C AUTHOR
C ______
C
C K. Fielding *ECMWF* Oct 1993
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
INTEGER KOWE, KONS, KPR, KERR
REAL PWFACT (4, KOWE, KONS), PSUM (KOWE)
C
C Local variables
INTEGER JOLAT, JOLON, JDIR
INTEGER JPROUTINE
PARAMETER (JPROUTINE = 25600)
C
C _______________________________________________________
C
C* Section 1. Initialisation
C _______________________________________________________
C
100 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGNORM: Section 1.',JPQUIET)
C
IGNORM = 0
C
IF (KPR .GE. 1) THEN
CALL INTLOG(JP_DEBUG,'IGNORM: No of output longitudes = ',KOWE)
CALL INTLOG(JP_DEBUG,'IGALLOC: No of output lattudes = ',KONS)
ENDIF
C
C _______________________________________________________
C
C* Section 2. Calculate arrays of weights
C _______________________________________________________
C
200 CONTINUE
C
IF (KPR.GE.1) CALL INTLOG(JP_DEBUG,'IGNORM: Section 2.',JPQUIET)
C
DO 260 JOLAT = 1, KONS
C
DO 210 JOLON = 1, KOWE
C
PSUM (JOLON) = PPZERO
C
210 CONTINUE
C
DO 230 JDIR = 1, 4
DO 220 JOLON = 1, KOWE
C
PSUM (JOLON) = PSUM (JOLON) +
1 PWFACT (JDIR, JOLON, JOLAT)
C
220 CONTINUE
230 CONTINUE
C
DO 250 JDIR = 1, 4
DO 240 JOLON = 1, KOWE
C
PWFACT (JDIR, JOLON, JOLAT) =
1 PWFACT (JDIR, JOLON, JOLAT) / PSUM (JOLON)
C
240 CONTINUE
250 CONTINUE
C
260 CONTINUE
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,'IGNORM: Section 9.',JPQUIET)
C
C
RETURN
END
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