CSISL(3)

SYNOPSIS
SUBROUTINE CSISL (A, LDA, N, KPVT, B)

NAME
csisl - Solve a complex symmetric system using the factors obtained from CSIFA.

LIBRARY
SLATEC (LINPACK)

CATEGORY
D2C1

TYPE
COMPLEX (SSISL-S, DSISL-D, CHISL-C, CSISL-C)

KEYWORDS
LINEAR ALGEBRA, LINPACK, MATRIX, SOLVE, SYMMETRIC

AUTHOR
Bunch, J., (UCSD)

DESCRIPTION
CSISL solves the complex symmetric system A * X = B using the factors computed by CSIFA. On Entry A COMPLEX(LDA,N) the output from CSIFA. LDA INTEGER the leading dimension of the array A . N INTEGER the order of the matrix A . KVPT INTEGER(N) the pivot vector from CSIFA. B COMPLEX(N) the right hand side vector. On Return B the solution vector X . Error Condition A division by zero may occur if CSICO has set RCOND .EQ. 0.0 or CSIFA has set INFO .NE. 0 . To compute INVERSE(A) * C where C is a matrix with P columns CALL CSIFA(A,LDA,N,KVPT,INFO) If (INFO .NE. 0) GO TO ... DO 10 J = 1, P CALL CSISL(A,LDA,N,KVPT,C(1,j)) 10 CONTINUE

REFERENCES
J. J. Dongarra, J. R. Bunch, C. B. Moler, and G. W. Stewart, LINPACK Users' Guide, SIAM, 1979.

ROUTINES CALLED
CAXPY, CDOTU

REVISION HISTORY (YYMMDD)
780814 DATE WRITTEN
890531 Changed all specific intrinsics to generic. (WRB)
890831 Modified array declarations. (WRB)
891107 Corrected category and modified routine equivalence list. (WRB)
891107 REVISION DATE from Version 3.2
891214 Prologue converted to Version 4.0 format. (BAB)
900326 Removed duplicate information from DESCRIPTION section. (WRB)
920501 Reformatted the REFERENCES section. (WRB)