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!C
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!C  SPACE SIMPLY LOADS THE CURRENT VALUES OF Geom AND GRAD INTO
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!C  THE ARRAYS GeomSet AND GradSet
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!C
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      SUBROUTINE SPACE(MRESET,MSET,Geom,GRAD,HEAT,NVAR,GeomSet,GradSet,ESET,FRST)
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!      IMPLICIT DOUBLE PRECISION (A-H,O-Z)
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!      INCLUDE 'SIZES'
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      IMPLICIT NONE
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      integer, parameter :: KINT = kind(1)
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      integer, parameter :: KREAL = kind(1.0d0)
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!      INCLUDE 'SIZES'
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 !MSET=mth iteration, NVAR=NCOORD, MRESET=Maximum no. of iterations.
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      INTEGER(KINT) :: NVAR, MRESET, MSET
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 !Geom=geometry with NVAR coordinates. GRAD=gradients.
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      REAL(KREAL) :: Geom(NVAR), GRAD(NVAR)
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      REAL(KREAL) :: Heat
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      LOGICAL :: FRST, Print=.TRUE.
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 ! GeomSet, GradSet : a long array to store
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      REAL(KREAL) :: GeomSet(MRESET*NVAR), GradSet(MRESET*NVAR), ESET(MRESET)
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        ! Geom and GRAD for all iterations.
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      INTEGER(KINT) :: I,J,K,NMK,MI,NI
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      INTEGER(KINT), SAVE :: NRESET
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!C
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!C     UPDATE PARAMETER AND GRADIENT SUBSPACE
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!C
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      IF (PRINT)  WRITE(*,'(/,''       BEGIN SPACE  '')')
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      IF(FRST)THEN
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         NRESET=MIN(NVAR/2,MRESET)
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             IF (NVAR .LT. 5 ) THEN ! This condition is imposed for small NVAR,
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             ! particularly if NVAR=NCOORD is equal to 2 or 3.
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                NRESET = NVAR-1
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           END IF
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         FRST=.FALSE.
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         MSET=0
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      ENDIF
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!C
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      !IF (PRINT)  WRITE(*,'(/,''       SPACE 1  '')')
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        ! purging the very first Geom and GRAD.
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        if (print) WRITE(*,*) "DBG Space MSET, NRESET",MSET,NRESET
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       IF (MSET .EQ. NRESET) THEN
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         DO 10 I=1,MSET-1
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            MI = NVAR*(I-1)
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            NI = NVAR*I
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            ESET(I)=ESET(I+1)
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            DO 10 K=1,NVAR
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               GeomSet(MI+K) = GeomSet(NI+K)
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   10    GradSet(MI+K) = GradSet(NI+K)
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            MSET=NRESET-1
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       ENDIF
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!C
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!C     STORE THE CURRENT POINT
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!C
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      !IF (PRINT)  WRITE(*,'(/,''       SPACE 2  '')')
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        ! NVAR =  NCOORD
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      DO  K=1,NVAR
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         NMK = NVAR*MSET+K ! MSET corresponds mth iteration.
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         IF (PRINT)  WRITE(*,*) 'K,NMK,MSET,NVAR',K,NMK,MSET,NVAR, &
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              SIZE(GeomSet), SIZE(GradSet),SIZE(Geom),SIZE(GRAD)
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         GeomSet(NMK) = Geom(K)
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         GradSet(NMK) = GRAD(K)
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      END DO
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      MSET=MSET+1
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      ESET(MSET)=HEAT
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      IF (PRINT) WRITE (*,*) "MSET=", MSET
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      IF (PRINT)  WRITE(*,'(/,''       END SPACE   '')')
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!C
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      RETURN
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      END