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unitfac.f
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REAL FUNCTION UNITFAC( UNIT1, UNIT2, LNUM )
C***********************************************************************
C function body starts at line
C
C DESCRIPTION:
C This function returns a units conversion factor based on the numerator
C (if any) of argument 1, and the numerator (if any) of argument two.
C If there are no units quotients, it treats the units field like a
C numerator.
C
C PRECONDITIONS REQUIRED:
C SUBROUTINES AND FUNCTIONS CALLED:
C
C REVISION HISTORY:
C Created by M. Houyoux 10/99
C
C**************************************************************************
C
C Project Title: EDSS Tools Library
C File: @(#)$Id$
C
C COPYRIGHT (C) 2004, Environmental Modeling for Policy Development
C All Rights Reserved
C
C Carolina Environmental Program
C University of North Carolina at Chapel Hill
C 137 E. Franklin St., CB# 6116
C Chapel Hill, NC 27599-6116
C
C smoke@unc.edu
C
C Pathname: $Source$
C Last updated: %G
C
C***************************************************************************
IMPLICIT NONE
C......... INCLUDES:
INCLUDE 'IOCNST3.EXT' ! I/O API constants
INCLUDE 'IOSTRG3.EXT' ! I/O string lengths
C........... EXTERNAL FUNCTIONS and their descriptions:
CHARACTER(2) CRLF
INTEGER STR2INT
EXTERNAL CRLF, STR2INT
C........... SUBROUTINE ARGUMENTS
CHARACTER(*), INTENT (IN) :: UNIT1 ! first unit
CHARACTER(*), INTENT (IN) :: UNIT2 ! second unit
LOGICAL , INTENT (IN) :: LNUM ! true: for numerators
C........... Other local variables
INTEGER I, K1, K2, L1, L2, LB1, LB2
INTEGER EXP1 ! exponent on first unit
INTEGER EXP2 ! exponent on second unit
REAL PRECNV ! Conversion for exponential prefixes
CHARACTER(IOULEN3) :: BUF1 = ' '
CHARACTER(IOULEN3) :: BUF2 = ' '
CHARACTER(16) :: PROGNAME = 'UNITFAC' ! program name
C***********************************************************************
C begin body of function UNITFAC
C......... Initialize factor
UNITFAC = 1.0
C......... Retrieve length of unit strings
L1 = LEN_TRIM( UNIT1 )
L2 = LEN_TRIM( UNIT2 )
C......... Cases where one or more of the provided units are blank
IF( L1 .LE. 0 .OR. L2 .LE. 0 ) RETURN
C......... Determine positions of the divide-by symbol in the units
K1 = INDEX( UNIT1, '/' )
K2 = INDEX( UNIT2, '/' )
C......... Define buffers as numerators or denominators, depending on
C value of LNUM
IF( LNUM ) THEN
IF( K1 .LE. 0 ) K1 = L1 + 1
IF( K2 .LE. 0 ) K2 = L2 + 1
BUF1 = UNIT1( 1:K1-1 )
BUF2 = UNIT2( 1:K2-1 )
ELSE
IF( K1 .LE. 0 ) K1 = 0
IF( K2 .LE. 0 ) K2 = 0
BUF1 = UNIT1( K1+1:L1 )
BUF2 = UNIT2( K2+1:L2 )
END IF
LB1 = LEN_TRIM( BUF1 )
LB2 = LEN_TRIM( BUF2 )
CALL UNITMATCH( BUF1 )
CALL UNITMATCH( BUF2 )
C......... Separate out any leading adjustments (e.g., 10E6)
EXP1 = 0
EXP2 = 0
K1 = INDEX( BUF1, '10E' )
K2 = INDEX( BUF2, '10E' )
IF( K1 .GT. 0 ) THEN
I = INDEX( BUF1, ' ' )
IF( I .GT. 0 ) THEN
EXP1 = STR2INT( BUF1( K1+3:I ) )
BUF1 = BUF1( I+1:LB1 )
END IF
END IF
IF( K2 .GT. 0 ) THEN
I = INDEX( BUF2, ' ' )
IF( I .GT. 0 ) THEN
EXP2 = STR2INT( BUF2( K2+3:I ) )
BUF1 = BUF2( I+1:LB2 )
END IF
END IF
C......... Set conversion factor by comparing units prefixes
PRECNV = 10**( EXP1 - EXP2 )
C......... Set conversion factor by comparing numerators of main units
SELECT CASE( BUF1 )
CASE( 'moles' )
SELECT CASE( BUF2 )
CASE( 'moles' )
UNITFAC = 1.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'g' )
SELECT CASE( BUF2 )
CASE( 'kg' )
UNITFAC = 1. / 1000.
CASE( 'tons' )
UNITFAC = GM2TON
CASE( 'g' )
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'kg' )
SELECT CASE( BUF2 )
CASE( 'g' )
UNITFAC = 1000.
CASE( 'tons' )
UNITFAC = GM2TON / 1000.
CASE( 'kg' )
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'tons' )
SELECT CASE( BUF2 )
CASE( 'g' )
UNITFAC = TON2GM
CASE( 'kg' )
UNITFAC = TON2GM / 1000.
CASE( 'tons' )
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'yr' )
SELECT CASE( BUF2 )
CASE( 'yr' )
CASE( 'day' )
UNITFAC = 365.
CASE( 'hr' )
UNITFAC = 365. * 24.
CASE( 'min' )
UNITFAC = 365. * 24. * 60.
CASE( 's' )
UNITFAC = 365. * 24. * 3600.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'day' )
SELECT CASE( BUF2 )
CASE( 'yr' )
UNITFAC = 1. / 365.
CASE( 'day' )
CASE( 'hr' )
UNITFAC = 24.
CASE( 'min' )
UNITFAC = 24. * 60.
CASE( 's' )
UNITFAC = 24. * 3600.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'hr' )
SELECT CASE( BUF2 )
CASE( 'yr' )
UNITFAC = 1. / ( 365. * 24. )
CASE( 'day' )
UNITFAC = 1. / 24.
CASE( 'hr' )
CASE( 'min' )
UNITFAC = 60.
CASE( 's' )
UNITFAC = 3600.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'min' )
SELECT CASE( BUF2 )
CASE( 'yr' )
UNITFAC = 1. / ( 365. * 24. * 60. )
CASE( 'day' )
UNITFAC = 1. / ( 24. * 60. )
CASE( 'hr' )
UNITFAC = 1. / 60.
CASE( 'min' )
CASE( 's' )
UNITFAC = 60.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 's' )
SELECT CASE( BUF2 )
CASE( 'yr' )
UNITFAC = 1. / ( 365. * 24. * 3600. )
CASE( 'day' )
UNITFAC = 1. / ( 24. * 3600. )
CASE( 'hr' )
UNITFAC = 1. / 3600.
CASE( 'min' )
UNITFAC = 1. / 60.
CASE( 's' )
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'km' )
SELECT CASE( BUF2 )
CASE( 'km' )
CASE( 'miles' )
UNITFAC = 0.6213712
CASE( 'm' )
UNITFAC = 1000.
CASE( 'ft' )
UNITFAC = 3280.84
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'miles' )
SELECT CASE( BUF2 )
CASE( 'km' )
UNITFAC = 1.609344
CASE( 'miles' )
CASE( 'm' )
UNITFAC = 1609.344
CASE( 'ft' )
UNITFAC = 5280.
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'm' )
SELECT CASE( BUF2 )
CASE( 'km' )
UNITFAC = 0.001
CASE( 'miles' )
UNITFAC = 6.213712E-4
CASE( 'm' )
CASE( 'ft' )
UNITFAC = 3.2808399
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE( 'ft' )
SELECT CASE( BUF2 )
CASE( 'km' )
UNITFAC = 0.0003048
CASE( 'miles' )
UNITFAC = 1.893939E-4
CASE( 'm' )
UNITFAC = 0.3048
CASE( 'ft' )
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
CASE DEFAULT
CALL CASE_NOT_FOUND( UNITFAC )
END SELECT
C......... Inckude any prefix adjustments
UNITFAC = UNITFAC * PRECNV
RETURN
C****************** INTERNAL SUBPROGRAMS *****************************
CONTAINS
C............. This subprogram checks for an internal error of the
C units conversion case not being programmed in the code
SUBROUTINE CASE_NOT_FOUND( FACTOR )
C............. Subprogram arguments
REAL, INTENT (OUT) :: FACTOR
C............. Local variables
CHARACTER(300) MESG
C----------------------------------------------------------------------
MESG = 'NOTE: Units conversion case not found for: "' //
& BUF1( 1:LB1 ) // '" with "' // BUF2( 1:LB2 ) // '"'//
& CRLF() // BLANK10// 'No conversion will be made.'
CALL M3MSG2( MESG )
FACTOR = -1.
RETURN
END SUBROUTINE CASE_NOT_FOUND
END FUNCTION UNITFAC