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

.in +1c
.ti -1c
.RI "subroutine \fBdrotm\fP (n, dx, incx, dy, incy, dparam)"
.br
.RI "\fBDROTM\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine drotm (integer n, double precision, dimension(*) dx, integer incx, double precision, dimension(*) dy, integer incy, double precision, dimension(5) dparam)"

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

.PP
.nf
    APPLY THE MODIFIED GIVENS TRANSFORMATION, H, TO THE 2 BY N MATRIX

    (DX**T) , WHERE **T INDICATES TRANSPOSE\&. THE ELEMENTS OF DX ARE IN
    (DY**T)

    DX(LX+I*INCX), I = 0 TO N-1, WHERE LX = 1 IF INCX \&.GE\&. 0, ELSE
    LX = (-INCX)*N, AND SIMILARLY FOR SY USING LY AND INCY\&.
    WITH DPARAM(1)=DFLAG, H HAS ONE OF THE FOLLOWING FORMS\&.\&.

    DFLAG=-1\&.D0     DFLAG=0\&.D0        DFLAG=1\&.D0     DFLAG=-2\&.D0

      (DH11  DH12)    (1\&.D0  DH12)    (DH11  1\&.D0)    (1\&.D0  0\&.D0)
    H=(          )    (          )    (          )    (          )
      (DH21  DH22),   (DH21  1\&.D0),   (-1\&.D0 DH22),   (0\&.D0  1\&.D0)\&.
    SEE DROTMG FOR A DESCRIPTION OF DATA STORAGE IN DPARAM\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIN\fP 
.PP
.nf
          N is INTEGER
         number of elements in input vector(s)
.fi
.PP
.br
\fIDX\fP 
.PP
.nf
          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
.fi
.PP
.br
\fIINCX\fP 
.PP
.nf
          INCX is INTEGER
         storage spacing between elements of DX
.fi
.PP
.br
\fIDY\fP 
.PP
.nf
          DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
.fi
.PP
.br
\fIINCY\fP 
.PP
.nf
          INCY is INTEGER
         storage spacing between elements of DY
.fi
.PP
.br
\fIDPARAM\fP 
.PP
.nf
          DPARAM is DOUBLE PRECISION array, dimension (5)
     DPARAM(1)=DFLAG
     DPARAM(2)=DH11
     DPARAM(3)=DH21
     DPARAM(4)=DH12
     DPARAM(5)=DH22
.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

.PP
Definition at line \fB95\fP of file \fBdrotm\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.