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aziwsa.f
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C
C azimuth weighted stack average
C StG 2024-05-14
C
C We read in a list of NAZVAL values
C azimuth weight
C
C and make a stack of curves
C dcos( azi - azimuth_i )*DABS( dcos( azi - azimuth_i ) )
C
C
C DWAZSF - Double Precision Weighted stack Azimuth Sum Form
C
PROGRAM aziwsa
IMPLICIT NONE
C
INTEGER NAZIB2
PARAMETER ( NAZIB2 = 180 )
INTEGER IERR
INTEGER IAZ
INTEGER NAZMAX
PARAMETER ( NAZMAX = 1000 )
INTEGER NAZVAL
REAL*8 DAZVLS( NAZMAX )
REAL*8 DWGVLS( NAZMAX )
REAL*8 DWGSTK( NAZIB2*2 )
REAL*8 DWORK( NAZIB2*2 )
REAL*8 D1
REAL*8 D2
CHARACTER*(80) CHLINE
C
NAZVAL = 0
50 CONTINUE
CHLINE = ' '
READ (5,'(A)',END=60,ERR=50) CHLINE
IF ( CHLINE(1:1).EQ.'*' ) GOTO 50
IF ( CHLINE(1:1).EQ.'#' ) GOTO 50
READ ( CHLINE, *, END=60,ERR=50) D1, D2
NAZVAL = NAZVAL + 1
IF ( NAZVAL.GT.NAZMAX ) THEN
WRITE (6,*) 'NAZMAX about to be exceeded '
GOTO 999
ENDIF
DAZVLS( NAZVAL ) = D1
DWGVLS( NAZVAL ) = D2
GOTO 50
60 CONTINUE
CALL DWAZSF( IERR, NAZIB2, NAZVAL, DAZVLS, DWGVLS,
1 DWGSTK, DWORK )
C
DO IAZ = 1, NAZIB2*2
WRITE (6,71) IAZ-1, DWGSTK( IAZ )
ENDDO
71 FORMAT(I10,1X,f16.8)
C
CALL EXIT(0)
999 CONTINUE
CALL EXIT(1)
END
C
SUBROUTINE DWAZSF( IERR, NAZIB2, NAZVAL, DAZVLS, DWGVLS,
1 DWGSTK, DWORK )
IMPLICIT NONE
C
INTEGER IERR
INTEGER NAZIB2
INTEGER NAZVAL
REAL*8 DAZVLS( NAZVAL )
REAL*8 DWGVLS( NAZVAL )
REAL*8 DWGSTK( NAZIB2*2 )
REAL*8 DWORK( NAZIB2*2 )
C
INTEGER IAZ
INTEGER IAZVAL
REAL*8 DLOW
PARAMETER ( DLOW = 1.0d-6 )
REAL*8 DTOTWT
REAL*8 DFAC
REAL*8 DAZREF
C
IERR = 0
IF ( NAZIB2.LT.4 ) THEN
WRITE (6,*) 'Subroutine DWAZSF: NAZIB2 = ', NAZIB2
IERR = 1
RETURN
ENDIF
C
C Calculate total weight ...
C
DTOTWT = 0.0d0
DO IAZVAL = 1, NAZVAL
DFAC = DWGVLS( IAZVAL )
IF ( DFAC.LT.DLOW ) THEN
WRITE (6,*) 'Subroutine DWAZSF: weight ',IAZVAL,' = ',DFAC
IERR = 1
RETURN
ENDIF
DTOTWT = DTOTWT + DFAC
ENDDO
C
C Now zero the weighted stack ...
C
DO IAZ = 1, NAZIB2*2
DWGSTK( IAZ ) = 0.0d0
ENDDO
C
C Now loop around the azimuth values and calculate the unit norm function
C then add the weighted function to the stack.
C
DO IAZVAL = 1, NAZVAL
DFAC = DWGVLS( IAZVAL )/DTOTWT
DAZREF = DAZVLS( IAZVAL )
c print *, IAZVAL, DAZREF, DFAC
CALL ACNCF2( IERR, NAZIB2, DAZREF, DWORK )
DO IAZ = 1, NAZIB2*2
DWGSTK( IAZ ) = DWGSTK( IAZ ) + DFAC*DWORK( IAZ )
ENDDO
ENDDO
C
RETURN
END
C
C
C Azimuth Centered Normalized Cosine Function calculate 2
C ACNCF2 makes curve with unit norm for azimuith DAZREF
C
SUBROUTINE ACNCF2( IERR, NAZIB2, DAZREF, DACNCF )
IMPLICIT NONE
C
INTEGER IERR
INTEGER NAZIB2
REAL*8 DAZREF
REAL*8 DACNCF( 2*NAZIB2 )
C
REAL*8 DPI
PARAMETER ( DPI = 3.14159265358979d0 )
REAL*8 DEGRAD
PARAMETER ( DEGRAD = DPI/180.0d0 )
C
INTEGER IAZ
REAL*8 RDAZIM
REAL*8 AZII
REAL*8 AZIDEG
REAL*8 DSUM
REAL*8 DSCALE
REAL*8 AZIRAD
REAL*8 DVALUE
C
IERR = 0
C return if NAZIB2 is invalid
IF ( NAZIB2.LT.4 ) THEN
WRITE (6,*) 'Subroutine ACNCF2: NAZIB2 = ', NAZIB2
IERR = 1
RETURN
ENDIF
C
RDAZIM = 180.0d0/DBLE( NAZIB2 )
AZII = 0.0d0
DO IAZ = 1, NAZIB2*2
AZIDEG = AZII - DAZREF
AZIRAD = AZIDEG*DEGRAD
DVALUE = DCOS( AZIRAD )
DACNCF( IAZ ) = DVALUE*DABS( DVALUE )
AZII = AZII + RDAZIM
ENDDO
C
C We now want to ensure that DACNCF has unit norm
C
DSUM = 0.0d0
DO IAZ = 1, NAZIB2*2
DSUM = DSUM + DACNCF( IAZ )*DACNCF( IAZ )
ENDDO
DSCALE = 1.0d0/DSQRT( DSUM )
DO IAZ = 1, NAZIB2*2
DACNCF( IAZ ) = DACNCF( IAZ )*DSCALE
ENDDO
C
RETURN
END
C