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C Copyright 1981-2016 ECMWF.
C
C This software is licensed under the terms of the Apache Licence
C Version 2.0 which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
C
C In applying this licence, ECMWF does not waive the privileges and immunities
C granted to it by virtue of its status as an intergovernmental organisation
C nor does it submit to any jurisdiction.
C
SUBROUTINE NMAKLL( KTRUNC, PINTVL, PLAT, KNUM, PLEG, KRET)
C
C---->
C**** NMAKLL
C
C PURPOSE
C _______
C
C This routine creates legendre functions for latitude rows from
C the given latitude.
C
C INTERFACE
C _________
C
C CALL NMAKLL( KTRUNC, PINTVL, PLAT, KNUM, PLEG, KRET)
C
C Input parameters
C ________________
C
C KTRUNC - Truncation.
C PINTVL - Grid interval (degrees)
C PLAT - Start latitude in degrees.
C KNUM - Number of latitudes
C
C Output parameters
C ________________
C
C PLEG - Array of legendre functions for the latitude.
C KRET - Return status code
C 0 = OK
C
C Common block usage
C __________________
C
C JDCNDBG
C
C Method
C ______
C
C See below.
C
C Externals
C _________
C
C INTLOG - Output log message
C INTLOGR - Output log message (with real value)
C
C Reference
C _________
C
C None.
C
C Comments
C ________
C
C None at present.
C
C AUTHOR
C ______
C
C J.D.Chambers *ECMWF* June 1999
C
C MODIFICATIONS
C _____________
C
C None.
C
C----<
C
IMPLICIT NONE
C
#include "jparams.h"
#include "parim.h"
C
C Parameters
C
INTEGER JPROUTINE
PARAMETER ( JPROUTINE = 30500 )
C
C Subroutine arguments
C
INTEGER KTRUNC, KRET, KNUM
REAL PLEG, PINTVL, PLAT
DIMENSION PLEG(*)
C
C Local variables
C
REAL ZLAST, ZLAT, ALAT, DEG2RAD
INTEGER NEXTRW, NEXT, FIRST, LAST
C
C _______________________________________________________
C
C* Section 1. Initialization.
C _______________________________________________________
C
100 CONTINUE
C
IF( NDBG.GT.1 ) THEN
CALL INTLOG(JP_DEBUG,'NMAKLL: Input parameters:',JPQUIET)
CALL INTLOG(JP_DEBUG,'NMAKLL: Truncation = ', KTRUNC)
CALL INTLOG(JP_DEBUG,'NMAKLL: Number of latitudes = ', KNUM)
CALL INTLOGR(JP_DEBUG,
X 'NMAKLL: Grid interval (degrees) = ', PINTVL)
CALL INTLOGR(JP_DEBUG,
X 'NMAKLL: Latitude in degrees = ', PLAT)
ENDIF
C
IF( PLAT.LT.0.0 ) THEN
ZLAT = 0.0
ELSE
ZLAT = PLAT
ENDIF
C
C _______________________________________________________
C
C* Section 2. Processing.
C _______________________________________________________
C
DEG2RAD = PPI / 180.0
C
ZLAST = ZLAT - (KNUM-1)*PINTVL
NEXTRW = 1
FIRST = NINT(ZLAT/PINTVL)
LAST = NINT(ZLAST/PINTVL)
DO NEXT = FIRST, LAST, -1
ALAT = (NEXT*PINTVL) * DEG2RAD
C
IF( NDBG.GT.1 ) CALL INTLOGR(JP_DEBUG,
X 'NMAKLL: Next latitude constructed = ', (NEXT*PINTVL))
C
CALL JSPLEG1( PLEG(NEXTRW), ALAT, KTRUNC)
NEXTRW = NEXTRW + (KTRUNC+1)*(KTRUNC+4)/2
ENDDO
C _______________________________________________________
C
C* Section 9. Return to calling routine. Format statements
C _______________________________________________________
C
900 CONTINUE
KRET = 0
C
990 CONTINUE
RETURN
END
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