init_random.F

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!||====================================================================
!||    init_random   ../starter/source/general_controls/computation/init_random.F
!||--- called by ------------------------------------------------------
!||    lectur        ../starter/source/starter/lectur.F
!||--- uses       -----------------------------------------------------
!||    random_mod    ../starter/share/modules1/random_mod.F
!||====================================================================
        SUBROUTINE init_random( )
!$COMMENT
!       INIT_RANDOM description
!       initialization of RAND_STRUCT structure     
!       
!       INIT_RANDOM organization :
!       - check -rxalea or -rseed cmd line is used
!       - check the value or -rxalea / -rseed and print
!         a warning if the value is not good
!$ENDCOMMENT
C-----------------------------------------------
C   M o d u l e s
C-----------------------------------------------
        USE random_mod
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   C o m m o n   B l o c k s
C-----------------------------------------------
#include      "units_c.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
        IF(rand_struct%CMD) THEN
 
            WRITE(iout,1000)
 
            IF(rand_struct%ALEA.AND.(.NOT.rand_struct%SEED) ) THEN
                !   apply default value to seed
                rand_struct%SEED=.true.
                rand_struct%SEED_NBR=0.d+00
                WRITE(iout,'(A)') ' '
                WRITE(iout,'(A)') '** WARNING : -RSEED OPTIONAL OPTION IS NOT USED'
                WRITE(iout,'(A)') '              DEFAULT VALUE WILL BE APPLIED'
                WRITE(iout,'(A)') ' '
            ENDIF
            IF(rand_struct%SEED) THEN
                IF(rand_struct%SEED_NBR<0.d+00.OR.rand_struct%SEED_NBR>1.d+00) THEN
                    !   error, 0 <= seed < 1
                    WRITE(iout,'(A)') ' '
                    WRITE(iout,'(A)') '** WARNING : -RSEED VALUE MUST BE DEFINED BETWEEN'
                    WRITE(iout,'(A)') '              0. AND 1.'     
                    WRITE(iout,'(A)') ' '
                ENDIF
            ENDIF
            IF(rand_struct%ALEA) THEN
                IF(rand_struct%ALEA_NBR<0.d+00.OR.rand_struct%ALEA_NBR>10.d+30) THEN
                    !   error, 0 <= alea < +infinity
                    WRITE(iout,'(A)') ' '
                    WRITE(iout,'(A)') '** WARNING : -RALEA VALUE MUST BE DEFINED BETWEEN'
                    WRITE(iout,'(A)') '              0 AND +INFINITY'       
                    WRITE(iout,'(A)') ' '
                ENDIF
            ELSE
                rand_struct%CMD=.false.
                WRITE(iout,'(A)') ' '
                WRITE(iout,'(A)') '** WARNING : -RSEED OPTIONAL OPTION MUST BE USED WITH -RXALEA OPTION'
                WRITE(iout,'(A)') '             -RSEED OPTION WILL BE IGNORED'
                WRITE(iout,'(A)') ' '
            ENDIF
        ENDIF
 
 1000 FORMAT(//
     .'     RANDOM NOISE       '/
     .'     ------------       ')
 
        RETURN
        END SUBROUTINE init_random