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IRIX 6.2 Development Libraries
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SSISL.z
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SSISL
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1996-03-14
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2KB
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67 lines
SSSSSSSSIIIISSSSLLLL((((3333FFFF)))) SSSSSSSSIIIISSSSLLLL((((3333FFFF))))
NNNNAAAAMMMMEEEE
SSISL - SSISL solves the real symmetric system A * X = B using the
factors computed by SSIFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE SSISL(A,LDA,N,KPVT,B)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA REAL(LDA,N)
the output from SSIFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A .
KKKKPPPPVVVVTTTT INTEGER(N)
the pivot vector from SSIFA.
BBBB REAL(N)
the right hand side vector. On Return
BBBB the solution vector X . Error Condition
AAAA division by zero may occur if SSICO has set RCOND .EQ. 0.0 or SSIFA
has set INFO .NE. 0 . To compute INVERSE(A) * C where C is a matrix
with P columns
CALL SSIFA(A,LDA,N,KPVT,INFO)
IF (INFO .NE. 0) GO TO ...
DO 10 J = 1, P
CALL SSISL(A,LDA,N,KPVT,C(1,J)) 10 CONTINUE LINPACK. This version
dated 08/14/78 . James Bunch, Univ. Calif. San Diego, Argonne Nat. Lab.
Subroutines and Functions BLAS SAXPY,SDOT Fortran IABS
PPPPaaaaggggeeee 1111