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IRIX 6.2 Development Libraries
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CPOSL.z
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CPOSL
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1996-03-14
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2KB
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67 lines
CCCCPPPPOOOOSSSSLLLL((((3333FFFF)))) CCCCPPPPOOOOSSSSLLLL((((3333FFFF))))
NNNNAAAAMMMMEEEE
CPOSL - CPOSL solves the COMPLEX Hermitian positive definite system A *
X = B using the factors computed by CPOCO or CPOFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE CPOSL(A,LDA,N,B)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAA COMPLEX(LDA, N)
the output from CPOCO or CPOFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array A .
NNNN INTEGER
the order of the matrix A .
BBBB COMPLEX(N)
the right hand side vector. On Return
BBBB the solution vector X . Error Condition
AAAA division by zero will occur if the input factor contains a zero on the
diagonal. Technically this indicates singularity but it is usually
caused by improper subroutine arguments. It will not occur if the
subroutines are called correctly and INFO .EQ. 0 . To compute
INVERSE(A) * C where C is a matrix with P columns
CALL CPOCO(A,LDA,N,RCOND,Z,INFO)
IF (RCOND is too small .OR. INFO .NE. 0) GO TO ...
DO 10 J = 1, P
CALL CPOSL(A,LDA,N,C(1,J)) 10 CONTINUE LINPACK. This version dated
08/14/78 . Cleve Moler, University of New Mexico, Argonne National Lab.
Subroutines and Functions BLAS CAXPY,CDOTC
PPPPaaaaggggeeee 1111