r3mtm.f90

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! Copyright (C) 2002-2005 J. K. Dewhurst, S. Sharma and C. Ambrosch-Draxl.
! This file is distributed under the terms of the GNU Lesser General Public
! License. See the file COPYING for license details.
 
!BOP
! !ROUTINE: r3mtm
! !INTERFACE:
pure subroutine r3mtm(a,b,c)
! !INPUT/OUTPUT PARAMETERS:
!   a : input matrix 1 (in,real(3,3))
!   b : input matrix 2 (in,real(3,3))
!   c : output matrix (out,real(3,3))
! !DESCRIPTION:
!   Multiplies the transpose of one real $3\times 3$ matrix with another.
!
! !REVISION HISTORY:
!   Created January 2003 (JKD)
!EOP
!BOC
implicit none
! arguments
real(8), intent(in) :: a(3,3),b(3,3)
real(8), intent(out) :: c(3,3)
c(1,1)=a(1,1)*b(1,1)+a(2,1)*b(2,1)+a(3,1)*b(3,1)
c(2,1)=a(1,2)*b(1,1)+a(2,2)*b(2,1)+a(3,2)*b(3,1)
c(3,1)=a(1,3)*b(1,1)+a(2,3)*b(2,1)+a(3,3)*b(3,1)
c(1,2)=a(1,1)*b(1,2)+a(2,1)*b(2,2)+a(3,1)*b(3,2)
c(2,2)=a(1,2)*b(1,2)+a(2,2)*b(2,2)+a(3,2)*b(3,2)
c(3,2)=a(1,3)*b(1,2)+a(2,3)*b(2,2)+a(3,3)*b(3,2)
c(1,3)=a(1,1)*b(1,3)+a(2,1)*b(2,3)+a(3,1)*b(3,3)
c(2,3)=a(1,2)*b(1,3)+a(2,2)*b(2,3)+a(3,2)*b(3,3)
c(3,3)=a(1,3)*b(1,3)+a(2,3)*b(2,3)+a(3,3)*b(3,3)
end subroutine
!EOC