.TH "SRC/slacon.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
SRC/slacon.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBslacon\fP (n, v, x, isgn, est, kase)"
.br
.RI "\fBSLACON\fP estimates the 1-norm of a square matrix, using reverse communication for evaluating matrix-vector products\&. "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine slacon (integer n, real, dimension( * ) v, real, dimension( * ) x, integer, dimension( * ) isgn, real est, integer kase)"

.PP
\fBSLACON\fP estimates the 1-norm of a square matrix, using reverse communication for evaluating matrix-vector products\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
!>
!> SLACON estimates the 1-norm of a square, real matrix A\&.
!> Reverse communication is used for evaluating matrix-vector products\&.
!> 
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIN\fP 
.PP
.nf
!>          N is INTEGER
!>         The order of the matrix\&.  N >= 1\&.
!> 
.fi
.PP
.br
\fIV\fP 
.PP
.nf
!>          V is REAL array, dimension (N)
!>         On the final return, V = A*W,  where  EST = norm(V)/norm(W)
!>         (W is not returned)\&.
!> 
.fi
.PP
.br
\fIX\fP 
.PP
.nf
!>          X is REAL array, dimension (N)
!>         On an intermediate return, X should be overwritten by
!>               A * X,   if KASE=1,
!>               A**T * X,  if KASE=2,
!>         and SLACON must be re-called with all the other parameters
!>         unchanged\&.
!> 
.fi
.PP
.br
\fIISGN\fP 
.PP
.nf
!>          ISGN is INTEGER array, dimension (N)
!> 
.fi
.PP
.br
\fIEST\fP 
.PP
.nf
!>          EST is REAL
!>         On entry with KASE = 1 or 2 and JUMP = 3, EST should be
!>         unchanged from the previous call to SLACON\&.
!>         On exit, EST is an estimate (a lower bound) for norm(A)\&.
!> 
.fi
.PP
.br
\fIKASE\fP 
.PP
.nf
!>          KASE is INTEGER
!>         On the initial call to SLACON, KASE should be 0\&.
!>         On an intermediate return, KASE will be 1 or 2, indicating
!>         whether X should be overwritten by A * X  or A**T * X\&.
!>         On the final return from SLACON, KASE will again be 0\&.
!> 
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 

.PP
Univ\&. of California Berkeley 

.PP
Univ\&. of Colorado Denver 

.PP
NAG Ltd\&. 
.RE
.PP
\fBContributors:\fP
.RS 4
Nick Higham, University of Manchester\&. 
.br
Originally named SONEST, dated March 16, 1988\&. 
.RE
.PP
\fBReferences:\fP
.RS 4
N\&.J\&. Higham, "FORTRAN codes for estimating the one-norm of
a real or complex matrix, with applications to condition estimation", ACM Trans\&. Math\&. Soft\&., vol\&. 14, no\&. 4, pp\&. 381-396, December 1988\&. 
.RE
.PP

.PP
Definition at line \fB114\fP of file \fBslacon\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.