.TH "slasy2.f" 3 "Sun May 26 2013" "Version 3.4.1" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
slasy2.f \- 
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBslasy2\fP (LTRANL, LTRANR, ISGN, N1, N2, TL, LDTL, TR, LDTR, B, LDB, SCALE, X, LDX, XNORM, INFO)"
.br
.RI "\fI\fBSLASY2\fP \fP"
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine slasy2 (logicalLTRANL, logicalLTRANR, integerISGN, integerN1, integerN2, real, dimension( ldtl, * )TL, integerLDTL, real, dimension( ldtr, * )TR, integerLDTR, real, dimension( ldb, * )B, integerLDB, realSCALE, real, dimension( ldx, * )X, integerLDX, realXNORM, integerINFO)"

.PP
\fBSLASY2\fP  
.PP
\fBPurpose: \fP
.RS 4

.PP
.nf
 SLASY2 solves for the N1 by N2 matrix X, 1 <= N1,N2 <= 2, in

        op(TL)*X + ISGN*X*op(TR) = SCALE*B,

 where TL is N1 by N1, TR is N2 by N2, B is N1 by N2, and ISGN = 1 or
 -1.  op(T) = T or T**T, where T**T denotes the transpose of T.
.fi
.PP
 
.RE
.PP
\fBParameters:\fP
.RS 4
\fILTRANL\fP 
.PP
.nf
          LTRANL is LOGICAL
          On entry, LTRANL specifies the op(TL):
             = .FALSE., op(TL) = TL,
             = .TRUE., op(TL) = TL**T.
.fi
.PP
.br
\fILTRANR\fP 
.PP
.nf
          LTRANR is LOGICAL
          On entry, LTRANR specifies the op(TR):
            = .FALSE., op(TR) = TR,
            = .TRUE., op(TR) = TR**T.
.fi
.PP
.br
\fIISGN\fP 
.PP
.nf
          ISGN is INTEGER
          On entry, ISGN specifies the sign of the equation
          as described before. ISGN may only be 1 or -1.
.fi
.PP
.br
\fIN1\fP 
.PP
.nf
          N1 is INTEGER
          On entry, N1 specifies the order of matrix TL.
          N1 may only be 0, 1 or 2.
.fi
.PP
.br
\fIN2\fP 
.PP
.nf
          N2 is INTEGER
          On entry, N2 specifies the order of matrix TR.
          N2 may only be 0, 1 or 2.
.fi
.PP
.br
\fITL\fP 
.PP
.nf
          TL is REAL array, dimension (LDTL,2)
          On entry, TL contains an N1 by N1 matrix.
.fi
.PP
.br
\fILDTL\fP 
.PP
.nf
          LDTL is INTEGER
          The leading dimension of the matrix TL. LDTL >= max(1,N1).
.fi
.PP
.br
\fITR\fP 
.PP
.nf
          TR is REAL array, dimension (LDTR,2)
          On entry, TR contains an N2 by N2 matrix.
.fi
.PP
.br
\fILDTR\fP 
.PP
.nf
          LDTR is INTEGER
          The leading dimension of the matrix TR. LDTR >= max(1,N2).
.fi
.PP
.br
\fIB\fP 
.PP
.nf
          B is REAL array, dimension (LDB,2)
          On entry, the N1 by N2 matrix B contains the right-hand
          side of the equation.
.fi
.PP
.br
\fILDB\fP 
.PP
.nf
          LDB is INTEGER
          The leading dimension of the matrix B. LDB >= max(1,N1).
.fi
.PP
.br
\fISCALE\fP 
.PP
.nf
          SCALE is REAL
          On exit, SCALE contains the scale factor. SCALE is chosen
          less than or equal to 1 to prevent the solution overflowing.
.fi
.PP
.br
\fIX\fP 
.PP
.nf
          X is REAL array, dimension (LDX,2)
          On exit, X contains the N1 by N2 solution.
.fi
.PP
.br
\fILDX\fP 
.PP
.nf
          LDX is INTEGER
          The leading dimension of the matrix X. LDX >= max(1,N1).
.fi
.PP
.br
\fIXNORM\fP 
.PP
.nf
          XNORM is REAL
          On exit, XNORM is the infinity-norm of the solution.
.fi
.PP
.br
\fIINFO\fP 
.PP
.nf
          INFO is INTEGER
          On exit, INFO is set to
             0: successful exit.
             1: TL and TR have too close eigenvalues, so TL or
                TR is perturbed to get a nonsingular equation.
          NOTE: In the interests of speed, this routine does not
                check the inputs for errors.
.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
\fBDate:\fP
.RS 4
November 2011 
.RE
.PP

.PP
Definition at line 174 of file slasy2\&.f\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.