finter.F

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#include "my_real.inc"
!||====================================================================
!||    finter                    ../starter/source/tools/curve/finter.F
!||--- called by ------------------------------------------------------
!||    cm58_refsta               ../starter/source/materials/mat/mat058/cm58_refsta.F
!||    fct_fiber_2               ../starter/source/materials/mat/mat098/lossfun_98.F
!||    hm_read_eos_compaction2   ../starter/source/materials/eos/hm_read_eos_compaction2.F90
!||    inimom_fvm                ../starter/source/elements/solid/solide/inimom_fvm.f
!||    law81_upd                 ../starter/source/materials/mat/mat081/law81_upd.F90
!||    law87_upd                 ../starter/source/materials/mat/mat087/law87_upd.F90
!||    lossfun_98                ../starter/source/materials/mat/mat098/lossfun_98.F
!||    m38init                   ../starter/source/materials/mat/mat038/m38init.F
!||    m75init                   ../starter/source/materials/mat/mat075/m75init.F
!||    m77init                   ../starter/source/materials/mat/mat077/m77init.F
!||    sigeps35                  ../starter/source/materials/mat/mat035/sigeps35.f
!||    sigeps37                  ../starter/source/materials/mat/mat037/sigeps37.F
!||    sigeps38                  ../starter/source/materials/mat/mat038/sigeps38.F
!||    sigeps42                  ../starter/source/materials/mat/mat042/sigeps42.F
!||    sigeps70                  ../starter/source/materials/mat/mat070/sigeps70.F
!||    sigeps90                  ../starter/source/materials/mat/mat090/sigeps90.F
!||====================================================================
      my_real FUNCTION finter(IFUNC,XX,NPF,TF,DERI)
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
      INTEGER ifunc,npf(*),i
      my_real tf(*),abc,deri,xx,dx1,dx2
 
      finter = 0
C
      dx2 = tf(npf(ifunc)) - xx
C
C     constant function
      IF ((npf(ifunc+1)-npf(ifunc))==2) THEN
        finter = tf(npf(ifunc)+1)
        RETURN
      ELSE
        DO 100 i=npf(ifunc)+2,npf(ifunc+1)-2,2
        dx1 = -dx2
        dx2 = tf(i) - xx
        IF(dx2>=zero.OR.i==npf(ifunc+1)-2)THEN
          deri = (tf(i+1) - tf(i-1)) / (tf(i) - tf(i-2))
          IF(dx1<=dx2)THEN
            finter = tf(i-1) + dx1 * deri
          ELSE
            finter = tf(i+1) - dx2 * deri
          ENDIF
          RETURN
        ENDIF
 100    CONTINUE
      END IF
C
      RETURN
      END