.TH "SRC/dla_porcond.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
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.SH NAME
SRC/dla_porcond.f
.SH SYNOPSIS
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.SS "Functions/Subroutines"

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.ti -1c
.RI "double precision function \fBdla_porcond\fP (uplo, n, a, lda, af, ldaf, cmode, c, info, work, iwork)"
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.RI "\fBDLA_PORCOND\fP estimates the Skeel condition number for a symmetric positive-definite matrix\&. "
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.SH "Function/Subroutine Documentation"
.PP 
.SS "double precision function dla_porcond (character uplo, integer n, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldaf, * ) af, integer ldaf, integer cmode, double precision, dimension( * ) c, integer info, double precision, dimension( * ) work, integer, dimension( * ) iwork)"

.PP
\fBDLA_PORCOND\fP estimates the Skeel condition number for a symmetric positive-definite matrix\&.  
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\fBPurpose:\fP
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!>
!>    DLA_PORCOND Estimates the Skeel condition number of  op(A) * op2(C)
!>    where op2 is determined by CMODE as follows
!>    CMODE =  1    op2(C) = C
!>    CMODE =  0    op2(C) = I
!>    CMODE = -1    op2(C) = inv(C)
!>    The Skeel condition number  cond(A) = norminf( |inv(A)||A| )
!>    is computed by computing scaling factors R such that
!>    diag(R)*A*op2(C) is row equilibrated and computing the standard
!>    infinity-norm condition number\&.
!> 
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.RE
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\fBParameters\fP
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\fIUPLO\fP 
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!>          UPLO is CHARACTER*1
!>       = 'U':  Upper triangle of A is stored;
!>       = 'L':  Lower triangle of A is stored\&.
!> 
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\fIN\fP 
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!>          N is INTEGER
!>     The number of linear equations, i\&.e\&., the order of the
!>     matrix A\&.  N >= 0\&.
!> 
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\fIA\fP 
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!>          A is DOUBLE PRECISION array, dimension (LDA,N)
!>     On entry, the N-by-N matrix A\&.
!> 
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\fILDA\fP 
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!>          LDA is INTEGER
!>     The leading dimension of the array A\&.  LDA >= max(1,N)\&.
!> 
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\fIAF\fP 
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!>          AF is DOUBLE PRECISION array, dimension (LDAF,N)
!>     The triangular factor U or L from the Cholesky factorization
!>     A = U**T*U or A = L*L**T, as computed by DPOTRF\&.
!> 
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\fILDAF\fP 
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!>          LDAF is INTEGER
!>     The leading dimension of the array AF\&.  LDAF >= max(1,N)\&.
!> 
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\fICMODE\fP 
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!>          CMODE is INTEGER
!>     Determines op2(C) in the formula op(A) * op2(C) as follows:
!>     CMODE =  1    op2(C) = C
!>     CMODE =  0    op2(C) = I
!>     CMODE = -1    op2(C) = inv(C)
!> 
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\fIC\fP 
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!>          C is DOUBLE PRECISION array, dimension (N)
!>     The vector C in the formula op(A) * op2(C)\&.
!> 
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\fIINFO\fP 
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!>          INFO is INTEGER
!>       = 0:  Successful exit\&.
!>     i > 0:  The ith argument is invalid\&.
!> 
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\fIWORK\fP 
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!>          WORK is DOUBLE PRECISION array, dimension (3*N)\&.
!>     Workspace\&.
!> 
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\fIIWORK\fP 
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!>          IWORK is INTEGER array, dimension (N)\&.
!>     Workspace\&.
!> 
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.RE
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\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 

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Univ\&. of California Berkeley 

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Univ\&. of Colorado Denver 

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NAG Ltd\&. 
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Definition at line \fB139\fP of file \fBdla_porcond\&.f\fP\&.
.SH "Author"
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Generated automatically by Doxygen for LAPACK from the source code\&.