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

.in +1c
.ti -1c
.RI "real function \fBsla_syrcond\fP (uplo, n, a, lda, af, ldaf, ipiv, cmode, c, info, work, iwork)"
.br
.RI "\fBSLA_SYRCOND\fP estimates the Skeel condition number for a symmetric indefinite matrix\&. "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "real function sla_syrcond (character uplo, integer n, real, dimension( lda, * ) a, integer lda, real, dimension( ldaf, * ) af, integer ldaf, integer, dimension( * ) ipiv, integer cmode, real, dimension( * ) c, integer info, real, dimension( * ) work, integer, dimension( * ) iwork)"

.PP
\fBSLA_SYRCOND\fP estimates the Skeel condition number for a symmetric indefinite matrix\&.  
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\fBPurpose:\fP
.RS 4

.PP
.nf
    SLA_SYRCOND 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
.PP
\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
.PP
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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\&.
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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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.nf
          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 block diagonal matrix D and the multipliers used to
     obtain the factor U or L as computed by SSYTRF\&.
.fi
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\fILDAF\fP 
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.nf
          LDAF is INTEGER
     The leading dimension of the array AF\&.  LDAF >= max(1,N)\&.
.fi
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\fIIPIV\fP 
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.nf
          IPIV is INTEGER array, dimension (N)
     Details of the interchanges and the block structure of D
     as determined by SSYTRF\&.
.fi
.PP
.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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.br
\fIC\fP 
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.nf
          C is REAL array, dimension (N)
     The vector C in the formula op(A) * op2(C)\&.
.fi
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.br
\fIINFO\fP 
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.nf
          INFO is INTEGER
       = 0:  Successful exit\&.
     i > 0:  The ith argument is invalid\&.
.fi
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\fIWORK\fP 
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.nf
          WORK is REAL array, dimension (3*N)\&.
     Workspace\&.
.fi
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.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

.PP
Definition at line \fB144\fP of file \fBsla_syrcond\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.