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

.in +1c
.ti -1c
.RI "subroutine \fBdlartg\fP (F, G, CS, SN, R)"
.br
.RI "\fI\fBDLARTG\fP generates a plane rotation with real cosine and real sine\&. \fP"
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dlartg (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR)"

.PP
\fBDLARTG\fP generates a plane rotation with real cosine and real sine\&.  
.PP
\fBPurpose: \fP
.RS 4

.PP
.nf
 DLARTG generate a plane rotation so that

    [  CS  SN  ]  .  [ F ]  =  [ R ]   where CS**2 + SN**2 = 1.
    [ -SN  CS  ]     [ G ]     [ 0 ]

 This is a slower, more accurate version of the BLAS1 routine DROTG,
 with the following other differences:
    F and G are unchanged on return.
    If G=0, then CS=1 and SN=0.
    If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
       floating point operations (saves work in DBDSQR when
       there are zeros on the diagonal).

 If F exceeds G in magnitude, CS will be positive.
.fi
.PP
 
.RE
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\fBParameters:\fP
.RS 4
\fIF\fP 
.PP
.nf
          F is DOUBLE PRECISION
          The first component of vector to be rotated.
.fi
.PP
.br
\fIG\fP 
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.nf
          G is DOUBLE PRECISION
          The second component of vector to be rotated.
.fi
.PP
.br
\fICS\fP 
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.nf
          CS is DOUBLE PRECISION
          The cosine of the rotation.
.fi
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.br
\fISN\fP 
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.nf
          SN is DOUBLE PRECISION
          The sine of the rotation.
.fi
.PP
.br
\fIR\fP 
.PP
.nf
          R is DOUBLE PRECISION
          The nonzero component of the rotated vector.

  This version has a few statements commented out for thread safety
  (machine parameters are computed on each entry). 10 feb 03, SJH.
.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
September 2012 
.RE
.PP

.PP
Definition at line 98 of file dlartg\&.f\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.