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IRIX 6.2 Development Libraries
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CPBSL.z
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CPBSL
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1996-03-14
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67 lines
CCCCPPPPBBBBSSSSLLLL((((3333FFFF)))) CCCCPPPPBBBBSSSSLLLL((((3333FFFF))))
NNNNAAAAMMMMEEEE
CPBSL - CPBSL solves the complex Hermitian positive definite band
system A*X = B using the factors computed by CPBCO or CPBFA.
SSSSYYYYNNNNOOOOPPPPSSSSYYYYSSSS
SUBROUTINE CPBSL(ABD,LDA,N,M,B)
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
On Entry
AAAABBBBDDDD COMPLEX(LDA, N)
the output from CPBCO or CPBFA.
LLLLDDDDAAAA INTEGER
the leading dimension of the array ABD .
NNNN INTEGER
the order of the matrix A .
MMMM INTEGER
the number of diagonals above the main diagonal.
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 CPBCO(ABD,LDA,N,RCOND,Z,INFO)
IF (RCOND is too small .OR. INFO .NE. 0) GO TO ...
DO 10 J = 1, P
CALL CPBSL(ABD,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 Fortran MIN0
PPPPaaaaggggeeee 1111