q4rrota2.F

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!||====================================================================
!||    q4rrota2   ../engine/source/elements/solid_2d/quad4/q4rrota2.F
!||--- called by ------------------------------------------------------
!||    q4forc2    ../engine/source/elements/solid_2d/quad4/q4forc2.F
!||    q4rcoor2   ../engine/source/elements/solid_2d/quad4/q4rcoor2.F
!||====================================================================
      SUBROUTINE q4rrota2(
     1   R22,     R23,     R32,     R33,
     2   Y1,      Y2,      Y3,      Y4,
     3   Z1,      Z2,      Z3,      Z4,
     4   NEL)
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-----------------------------------------------
C-----------------------------------------------
C   D u m m y   A r g u m e n t s
C-----------------------------------------------
      INTEGER, INTENT(IN) :: NEL
C     REAL
      my_real
     .   R22(*), R23(*), R32(*), R33(*),
     .   y1(*), y2(*), y3(*), y4(*),
     .   z1(*), z2(*), z3(*), z4(*)
C-----------------------------------------------
c FUNCTION: 
c ARGUMENTS:  (I: input, O: output, IO: input & output, W: workspace)
c TYPE NAME                FUNCTION
c  I   R22(*)~R33(*)      - [Rij]
c  IO  Y1(*)~Z4(*)        - {X}-->{X'}
C-----------------------------------------------
C   L o c a l   V a r i a b l e s
C-----------------------------------------------
      INTEGER I
C     REAL
      my_real
     .   Y,Z
C-----------------------------------------------
C   S o u r c e  L i n e s
C-----------------------------------------------
C     {X}=[R]{X'} <=> {X'}=T([R]){X}
C     INPUT: [R], {X}
C     OUTPUT: {X'}
      DO i=1,nel
        y=r22(i)*y1(i)+r32(i)*z1(i)
        z=r23(i)*y1(i)+r33(i)*z1(i)
        y1(i)=y
        z1(i)=z
        y=r22(i)*y2(i)+r32(i)*z2(i)
        z=r23(i)*y2(i)+r33(i)*z2(i)
        y2(i)=y
        z2(i)=z
        y=r22(i)*y3(i)+r32(i)*z3(i)
        z=r23(i)*y3(i)+r33(i)*z3(i)
        y3(i)=y
        z3(i)=z
        y=r22(i)*y4(i)+r32(i)*z4(i)
        z=r23(i)*y4(i)+r33(i)*z4(i)
        y4(i)=y
        z4(i)=z
      ENDDO
C
      RETURN
      END