.TH "lasq6" 3 "Wed Feb 7 2024 11:30:40" "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
lasq6 \- lasq6: dqds step
.SH SYNOPSIS
.br
.PP
.SS "Functions"

.in +1c
.ti -1c
.RI "subroutine \fBdlasq6\fP (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2)"
.br
.RI "\fBDLASQ6\fP computes one dqd transform in ping-pong form\&. Used by sbdsqr and sstegr\&. "
.ti -1c
.RI "subroutine \fBslasq6\fP (i0, n0, z, pp, dmin, dmin1, dmin2, dn, dnm1, dnm2)"
.br
.RI "\fBSLASQ6\fP computes one dqd transform in ping-pong form\&. Used by sbdsqr and sstegr\&. "
.in -1c
.SH "Detailed Description"
.PP 

.SH "Function Documentation"
.PP 
.SS "subroutine dlasq6 (integer i0, integer n0, double precision, dimension( * ) z, integer pp, double precision dmin, double precision dmin1, double precision dmin2, double precision dn, double precision dnm1, double precision dnm2)"

.PP
\fBDLASQ6\fP computes one dqd transform in ping-pong form\&. Used by sbdsqr and sstegr\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 DLASQ6 computes one dqd (shift equal to zero) transform in
 ping-pong form, with protection against underflow and overflow\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fII0\fP 
.PP
.nf
          I0 is INTEGER
        First index\&.
.fi
.PP
.br
\fIN0\fP 
.PP
.nf
          N0 is INTEGER
        Last index\&.
.fi
.PP
.br
\fIZ\fP 
.PP
.nf
          Z is DOUBLE PRECISION array, dimension ( 4*N )
        Z holds the qd array\&. EMIN is stored in Z(4*N0) to avoid
        an extra argument\&.
.fi
.PP
.br
\fIPP\fP 
.PP
.nf
          PP is INTEGER
        PP=0 for ping, PP=1 for pong\&.
.fi
.PP
.br
\fIDMIN\fP 
.PP
.nf
          DMIN is DOUBLE PRECISION
        Minimum value of d\&.
.fi
.PP
.br
\fIDMIN1\fP 
.PP
.nf
          DMIN1 is DOUBLE PRECISION
        Minimum value of d, excluding D( N0 )\&.
.fi
.PP
.br
\fIDMIN2\fP 
.PP
.nf
          DMIN2 is DOUBLE PRECISION
        Minimum value of d, excluding D( N0 ) and D( N0-1 )\&.
.fi
.PP
.br
\fIDN\fP 
.PP
.nf
          DN is DOUBLE PRECISION
        d(N0), the last value of d\&.
.fi
.PP
.br
\fIDNM1\fP 
.PP
.nf
          DNM1 is DOUBLE PRECISION
        d(N0-1)\&.
.fi
.PP
.br
\fIDNM2\fP 
.PP
.nf
          DNM2 is DOUBLE PRECISION
        d(N0-2)\&.
.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 slasq6 (integer i0, integer n0, real, dimension( * ) z, integer pp, real dmin, real dmin1, real dmin2, real dn, real dnm1, real dnm2)"

.PP
\fBSLASQ6\fP computes one dqd transform in ping-pong form\&. Used by sbdsqr and sstegr\&.  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 SLASQ6 computes one dqd (shift equal to zero) transform in
 ping-pong form, with protection against underflow and overflow\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fII0\fP 
.PP
.nf
          I0 is INTEGER
        First index\&.
.fi
.PP
.br
\fIN0\fP 
.PP
.nf
          N0 is INTEGER
        Last index\&.
.fi
.PP
.br
\fIZ\fP 
.PP
.nf
          Z is REAL array, dimension ( 4*N )
        Z holds the qd array\&. EMIN is stored in Z(4*N0) to avoid
        an extra argument\&.
.fi
.PP
.br
\fIPP\fP 
.PP
.nf
          PP is INTEGER
        PP=0 for ping, PP=1 for pong\&.
.fi
.PP
.br
\fIDMIN\fP 
.PP
.nf
          DMIN is REAL
        Minimum value of d\&.
.fi
.PP
.br
\fIDMIN1\fP 
.PP
.nf
          DMIN1 is REAL
        Minimum value of d, excluding D( N0 )\&.
.fi
.PP
.br
\fIDMIN2\fP 
.PP
.nf
          DMIN2 is REAL
        Minimum value of d, excluding D( N0 ) and D( N0-1 )\&.
.fi
.PP
.br
\fIDN\fP 
.PP
.nf
          DN is REAL
        d(N0), the last value of d\&.
.fi
.PP
.br
\fIDNM1\fP 
.PP
.nf
          DNM1 is REAL
        d(N0-1)\&.
.fi
.PP
.br
\fIDNM2\fP 
.PP
.nf
          DNM2 is REAL
        d(N0-2)\&.
.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\&.