.TH "SRC/dlas2.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
SRC/dlas2.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBdlas2\fP (f, g, h, ssmin, ssmax)"
.br
.RI "\fBDLAS2\fP computes singular values of a 2-by-2 triangular matrix\&. "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dlas2 (double precision f, double precision g, double precision h, double precision ssmin, double precision ssmax)"

.PP
\fBDLAS2\fP computes singular values of a 2-by-2 triangular matrix\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 DLAS2  computes the singular values of the 2-by-2 matrix
    [  F   G  ]
    [  0   H  ]\&.
 On return, SSMIN is the smaller singular value and SSMAX is the
 larger singular value\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIF\fP 
.PP
.nf
          F is DOUBLE PRECISION
          The (1,1) element of the 2-by-2 matrix\&.
.fi
.PP
.br
\fIG\fP 
.PP
.nf
          G is DOUBLE PRECISION
          The (1,2) element of the 2-by-2 matrix\&.
.fi
.PP
.br
\fIH\fP 
.PP
.nf
          H is DOUBLE PRECISION
          The (2,2) element of the 2-by-2 matrix\&.
.fi
.PP
.br
\fISSMIN\fP 
.PP
.nf
          SSMIN is DOUBLE PRECISION
          The smaller singular value\&.
.fi
.PP
.br
\fISSMAX\fP 
.PP
.nf
          SSMAX is DOUBLE PRECISION
          The larger singular value\&.
.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

.PP
.nf
  Barring over/underflow, all output quantities are correct to within
  a few units in the last place (ulps), even in the absence of a guard
  digit in addition/subtraction\&.

  In IEEE arithmetic, the code works correctly if one matrix element is
  infinite\&.

  Overflow will not occur unless the largest singular value itself
  overflows, or is within a few ulps of overflow\&.

  Underflow is harmless if underflow is gradual\&. Otherwise, results
  may correspond to a matrix modified by perturbations of size near
  the underflow threshold\&.
.fi
.PP
 
.RE
.PP

.PP
Definition at line \fB104\fP of file \fBdlas2\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.