.TH "sla_porcond.f" 3 "Wed Oct 15 2014" "Version 3.4.2" "LAPACK" \" -*- nroff -*-
.ad l
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.SH NAME
sla_porcond.f \- 
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "real function \fBsla_porcond\fP (UPLO, N, A, LDA, AF, LDAF, CMODE, C, INFO, WORK, IWORK)"
.br
.RI "\fI\fBSLA_PORCOND\fP estimates the Skeel condition number for a symmetric positive-definite matrix\&. \fP"
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "real function sla_porcond (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, real, dimension( ldaf, * )AF, integerLDAF, integerCMODE, real, dimension( * )C, integerINFO, real, dimension( * )WORK, integer, dimension( * )IWORK)"

.PP
\fBSLA_PORCOND\fP estimates the Skeel condition number for a symmetric positive-definite matrix\&.  
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\fBPurpose: \fP
.RS 4

.PP
.nf
    SLA_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.
.fi
.PP
 
.RE
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\fBParameters:\fP
.RS 4
\fIUPLO\fP 
.PP
.nf
          UPLO is CHARACTER*1
       = 'U':  Upper triangle of A is stored;
       = 'L':  Lower triangle of A is stored.
.fi
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\fIN\fP 
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.nf
          N is INTEGER
     The number of linear equations, i.e., the order of the
     matrix A.  N >= 0.
.fi
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\fIA\fP 
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          A is REAL array, dimension (LDA,N)
     On entry, the N-by-N matrix A.
.fi
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\fILDA\fP 
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          LDA is INTEGER
     The leading dimension of the array A.  LDA >= max(1,N).
.fi
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\fIAF\fP 
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.nf
          AF is REAL 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 SPOTRF.
.fi
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\fILDAF\fP 
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          LDAF is INTEGER
     The leading dimension of the array AF.  LDAF >= max(1,N).
.fi
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.br
\fICMODE\fP 
.PP
.nf
          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)
.fi
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\fIC\fP 
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          C is REAL array, dimension (N)
     The vector C in the formula op(A) * op2(C).
.fi
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\fIINFO\fP 
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          INFO is INTEGER
       = 0:  Successful exit.
     i > 0:  The ith argument is invalid.
.fi
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.br
\fIWORK\fP 
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          WORK is REAL array, dimension (3*N).
     Workspace.
.fi
.PP
.br
\fIIWORK\fP 
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.nf
          IWORK is INTEGER array, dimension (N).
     Workspace.
.fi
.PP
 
.RE
.PP
\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\&. 
.RE
.PP
\fBDate:\fP
.RS 4
September 2012 
.RE
.PP

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Definition at line 140 of file sla_porcond\&.f\&.
.SH "Author"
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Generated automatically by Doxygen for LAPACK from the source code\&.