.TH "lartgp" 3 "Wed Feb 7 2024 11:30:40" "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
lartgp \- lartgp: generate plane rotation, more accurate than BLAS rot
.SH SYNOPSIS
.br
.PP
.SS "Functions"

.in +1c
.ti -1c
.RI "subroutine \fBdlartgp\fP (f, g, cs, sn, r)"
.br
.RI "\fBDLARTGP\fP generates a plane rotation so that the diagonal is nonnegative\&. "
.ti -1c
.RI "subroutine \fBslartgp\fP (f, g, cs, sn, r)"
.br
.RI "\fBSLARTGP\fP generates a plane rotation so that the diagonal is nonnegative\&. "
.in -1c
.SH "Detailed Description"
.PP 

.SH "Function Documentation"
.PP 
.SS "subroutine dlartgp (double precision f, double precision g, double precision cs, double precision sn, double precision r)"

.PP
\fBDLARTGP\fP generates a plane rotation so that the diagonal is nonnegative\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 DLARTGP generates 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 Level 1 BLAS 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\&.

 The sign is chosen so that R >= 0\&.
.fi
.PP
 
.RE
.PP
\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 
.PP
.nf
          G is DOUBLE PRECISION
          The second component of vector to be rotated\&.
.fi
.PP
.br
\fICS\fP 
.PP
.nf
          CS is DOUBLE PRECISION
          The cosine of the rotation\&.
.fi
.PP
.br
\fISN\fP 
.PP
.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

.SS "subroutine slartgp (real f, real g, real cs, real sn, real r)"

.PP
\fBSLARTGP\fP generates a plane rotation so that the diagonal is nonnegative\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 SLARTGP generates 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 Level 1 BLAS routine SROTG,
 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\&.

 The sign is chosen so that R >= 0\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIF\fP 
.PP
.nf
          F is REAL
          The first component of vector to be rotated\&.
.fi
.PP
.br
\fIG\fP 
.PP
.nf
          G is REAL
          The second component of vector to be rotated\&.
.fi
.PP
.br
\fICS\fP 
.PP
.nf
          CS is REAL
          The cosine of the rotation\&.
.fi
.PP
.br
\fISN\fP 
.PP
.nf
          SN is REAL
          The sine of the rotation\&.
.fi
.PP
.br
\fIR\fP 
.PP
.nf
          R is REAL
          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

.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.