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

.in +1c
.ti -1c
.RI "double precision function \fBdlamch\fP (cmach)"
.br
.RI "\fBDLAMCH\fP "
.ti -1c
.RI "double precision function \fBdlamc3\fP (a, b)"
.br
.RI "\fBDLAMC3\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "double precision function dlamc3 (double precision a, double precision b)"

.PP
\fBDLAMC3\fP \fBPurpose:\fP 
.PP
.nf
 DLAMC3  is intended to force  A  and  B  to be stored prior to doing
 the addition of  A  and  B ,  for use in situations where optimizers
 might hold one of these in a register\&.
.fi
.PP
 
.PP
\fBAuthor\fP
.RS 4
LAPACK is a software package provided by Univ\&. of Tennessee, Univ\&. of California Berkeley, Univ\&. of Colorado Denver and NAG Ltd\&.\&. 
.RE
.PP
\fBParameters\fP
.RS 4
\fIA\fP 
.PP
.nf
          A is a DOUBLE PRECISION
.fi
.PP
.br
\fIB\fP 
.PP
.nf
          B is a DOUBLE PRECISION
          The values A and B\&.
.fi
.PP
 
.RE
.PP

.PP
Definition at line \fB171\fP of file \fBdlamch\&.f\fP\&.
.SS "double precision function dlamch (character cmach)"

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

.PP
.nf
 DLAMCH determines double precision machine parameters\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fICMACH\fP 
.PP
.nf
          CMACH is CHARACTER*1
          Specifies the value to be returned by DLAMCH:
          = 'E' or 'e',   DLAMCH := eps
          = 'S' or 's ,   DLAMCH := sfmin
          = 'B' or 'b',   DLAMCH := base
          = 'P' or 'p',   DLAMCH := eps*base
          = 'N' or 'n',   DLAMCH := t
          = 'R' or 'r',   DLAMCH := rnd
          = 'M' or 'm',   DLAMCH := emin
          = 'U' or 'u',   DLAMCH := rmin
          = 'L' or 'l',   DLAMCH := emax
          = 'O' or 'o',   DLAMCH := rmax
          where
          eps   = relative machine precision
          sfmin = safe minimum, such that 1/sfmin does not overflow
          base  = base of the machine
          prec  = eps*base
          t     = number of (base) digits in the mantissa
          rnd   = 1\&.0 when rounding occurs in addition, 0\&.0 otherwise
          emin  = minimum exponent before (gradual) underflow
          rmin  = underflow threshold - base**(emin-1)
          emax  = largest exponent before overflow
          rmax  = overflow threshold  - (base**emax)*(1-eps)
.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 \fB68\fP of file \fBdlamch\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.