chbas.F

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C
!||====================================================================
!||    chbas    ../starter/source/constraints/general/rbody/chbas.F
!||--- called by ------------------------------------------------------
!||    inirby   ../starter/source/constraints/general/rbody/inirby.F
!||====================================================================
      SUBROUTINE chbas(A,M)
C
C    ENTREES A MATRICE DE PASSAGE X'=AX
C            M MATRICE DANS LA BASE X'
C    SORTIES M MATRICE DANS LA BASE X
C               M=A-1*M*A=AT*M*A
C-----------------------------------------------
C   I m p l i c i t   T y p e s
C-----------------------------------------------
#include      "implicit_f.inc"
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
C     REAL
      my_real
     .   a(3,*), m(3,*)
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I, J, K
C     REAL
      my_real
     .   c(3,3)
        DO 30 i=1,3
          DO 20 j=1,3
            c(i,j)=0.
            DO 10 k=1,3
              c(i,j)=c(i,j)+a(i,k)*m(k,j)
 10         CONTINUE
 20       CONTINUE
 30     CONTINUE
        DO 60 i=1,3
          DO 50 j=1,3
            m(i,j)=0.
            DO 40 k=1,3
              m(i,j)=m(i,j)+c(i,k)*a(j,k)
 40         CONTINUE
 50       CONTINUE
 60     CONTINUE
C
      RETURN
      END