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62 lines
2.8 KiB
62 lines
2.8 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE MXMULT(N,MAT1,MAT2,MATR)
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REAL MAT1(N,*),MAT2(N,*),MATR(N,*)
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IF (N .EQ. 4) THEN
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MATR(1,1) = MAT1(1,1)*MAT2(1,1) + MAT1(1,2)*MAT2(2,1) +
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* MAT1(1,3)*MAT2(3,1) + MAT1(1,4)*MAT2(4,1)
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MATR(1,2) = MAT1(1,1)*MAT2(1,2) + MAT1(1,2)*MAT2(2,2) +
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* MAT1(1,3)*MAT2(3,2) + MAT1(1,4)*MAT2(4,2)
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MATR(1,3) = MAT1(1,1)*MAT2(1,3) + MAT1(1,2)*MAT2(2,3) +
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* MAT1(1,3)*MAT2(3,3) + MAT1(1,4)*MAT2(4,3)
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MATR(1,4) = MAT1(1,1)*MAT2(1,4) + MAT1(1,2)*MAT2(2,4) +
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* MAT1(1,3)*MAT2(3,4) + MAT1(1,4)*MAT2(4,4)
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MATR(2,1) = MAT1(2,1)*MAT2(1,1) + MAT1(2,2)*MAT2(2,1) +
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* MAT1(2,3)*MAT2(3,1) + MAT1(2,4)*MAT2(4,1)
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MATR(2,2) = MAT1(2,1)*MAT2(1,2) + MAT1(2,2)*MAT2(2,2) +
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* MAT1(2,3)*MAT2(3,2) + MAT1(2,4)*MAT2(4,2)
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MATR(2,3) = MAT1(2,1)*MAT2(1,3) + MAT1(2,2)*MAT2(2,3) +
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* MAT1(2,3)*MAT2(3,3) + MAT1(2,4)*MAT2(4,3)
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MATR(2,4) = MAT1(2,1)*MAT2(1,4) + MAT1(2,2)*MAT2(2,4) +
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* MAT1(2,3)*MAT2(3,4) + MAT1(2,4)*MAT2(4,4)
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MATR(3,1) = MAT1(3,1)*MAT2(1,1) + MAT1(3,2)*MAT2(2,1) +
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* MAT1(3,3)*MAT2(3,1) + MAT1(3,4)*MAT2(4,1)
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MATR(3,2) = MAT1(3,1)*MAT2(1,2) + MAT1(3,2)*MAT2(2,2) +
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* MAT1(3,3)*MAT2(3,2) + MAT1(3,4)*MAT2(4,2)
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MATR(3,3) = MAT1(3,1)*MAT2(1,3) + MAT1(3,2)*MAT2(2,3) +
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* MAT1(3,3)*MAT2(3,3) + MAT1(3,4)*MAT2(4,3)
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MATR(3,4) = MAT1(3,1)*MAT2(1,4) + MAT1(3,2)*MAT2(2,4) +
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* MAT1(3,3)*MAT2(3,4) + MAT1(3,4)*MAT2(4,4)
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MATR(4,1) = MAT1(4,1)*MAT2(1,1) + MAT1(4,2)*MAT2(2,1) +
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* MAT1(4,3)*MAT2(3,1) + MAT1(4,4)*MAT2(4,1)
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MATR(4,2) = MAT1(4,1)*MAT2(1,2) + MAT1(4,2)*MAT2(2,2) +
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* MAT1(4,3)*MAT2(3,2) + MAT1(4,4)*MAT2(4,2)
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MATR(4,3) = MAT1(4,1)*MAT2(1,3) + MAT1(4,2)*MAT2(2,3) +
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* MAT1(4,3)*MAT2(3,3) + MAT1(4,4)*MAT2(4,3)
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MATR(4,4) = MAT1(4,1)*MAT2(1,4) + MAT1(4,2)*MAT2(2,4) +
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* MAT1(4,3)*MAT2(3,4) + MAT1(4,4)*MAT2(4,4)
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ELSE
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DO 230 K = 1,N
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DO 200 J = 1,N
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MATR(K,J) = 0.0
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200 CONTINUE
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DO 220 I = 1,N
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DO 210 J = 1,N
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MATR(K,J) = MATR(K,J) + MAT1(K,I)*MAT2(I,J)
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210 CONTINUE
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220 CONTINUE
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230 CONTINUE
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END IF
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RETURN
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END
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