NAME

SYNOPSIS

  SUBROUTINE ZGTSL( N, SUB, DIAG, SUPER, B, INFO)
  DOUBLE COMPLEX SUB(*), DIAG(*), SUPER(*), B(*)
  INTEGER N, INFO
 
  SUBROUTINE ZGTSL_64( N, SUB, DIAG, SUPER, B, INFO)
  DOUBLE COMPLEX SUB(*), DIAG(*), SUPER(*), B(*)
  INTEGER*8 N, INFO
 

C INTERFACE

void zgtsl(int n, doublecomplex *sub, doublecomplex *diag, doublecomplex *super, doublecomplex *b, int *info);

void zgtsl_64(long n, doublecomplex *sub, doublecomplex *diag, doublecomplex *super, doublecomplex *b, long *info);

ARGUMENTS

* N (input)

Order of the matrix A. N >= 0.

* SUB (input)

Subdiagonal of A. SUB(2) through SUB(N) contain the subdiagonal and SUB(1) is not referenced.

* DIAG (input)

Diagonal of A.

* SUPER (input)

Superdiagonal of A. SUPER(1) through SUPER(N-1) contain the superdiagonal and SUPER(N) is not referenced.

* B (input/output)

On entry, the right-hand side vector b. On exit, the solution vector x.

* INFO (output)

On exit:

INFO = 0 Subroutine completed normally.

INFO > 0 Returns a value k when the kth element of the diagonal becomes exactly zero.