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

.in +1c
.ti -1c
.RI "subroutine \fBzlacon\fP (n, v, x, est, kase)"
.br
.RI "\fBZLACON\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 zlacon (integer n, complex*16, dimension( n ) v, complex*16, dimension( n ) x, double precision est, integer kase)"

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

.PP
.nf
!>
!> ZLACON estimates the 1-norm of a square, complex matrix A\&.
!> Reverse communication is used for evaluating matrix-vector products\&.
!> 
.fi
.PP
 
.RE
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\fBParameters\fP
.RS 4
\fIN\fP 
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.nf
!>          N is INTEGER
!>         The order of the matrix\&.  N >= 1\&.
!> 
.fi
.PP
.br
\fIV\fP 
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.nf
!>          V is COMPLEX*16 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 COMPLEX*16 array, dimension (N)
!>         On an intermediate return, X should be overwritten by
!>               A * X,   if KASE=1,
!>               A**H * X,  if KASE=2,
!>         where A**H is the conjugate transpose of A, and ZLACON must be
!>         re-called with all the other parameters unchanged\&.
!> 
.fi
.PP
.br
\fIEST\fP 
.PP
.nf
!>          EST is DOUBLE PRECISION
!>         On entry with KASE = 1 or 2 and JUMP = 3, EST should be
!>         unchanged from the previous call to ZLACON\&.
!>         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 ZLACON, 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**H * X\&.
!>         On the final return from ZLACON, 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
\fBFurther Details:\fP
.RS 4
Originally named CONEST, dated March 16, 1988\&. 
.br
Last modified: April, 1999 
.RE
.PP
\fBContributors:\fP
.RS 4
Nick Higham, University of Manchester 
.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 \fB113\fP of file \fBzlacon\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.