# slamch.f - Man Page

INSTALL/slamch.f

## Synopsis

### Functions/Subroutines

real function **slamch** (cmach)**SLAMCH**

real function **slamc3** (a, b)**SLAMC3**

## Function/Subroutine Documentation

### real function slamc3 (real a, real b)

**SLAMC3 Purpose:**

SLAMC3 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.

**Author**LAPACK is a software package provided by Univ. of Tennessee, Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..

**Parameters***A**B*The values A and B.

Definition at line **170** of file **slamch.f**.

### real function slamch (character cmach)

**SLAMCH**

**Purpose:**

SLAMCH determines single precision machine parameters.

**Parameters***CMACH*CMACH is CHARACTER*1 Specifies the value to be returned by SLAMCH: = 'E' or 'e', SLAMCH := eps = 'S' or 's , SLAMCH := sfmin = 'B' or 'b', SLAMCH := base = 'P' or 'p', SLAMCH := eps*base = 'N' or 'n', SLAMCH := t = 'R' or 'r', SLAMCH := rnd = 'M' or 'm', SLAMCH := emin = 'U' or 'u', SLAMCH := rmin = 'L' or 'l', SLAMCH := emax = 'O' or 'o', SLAMCH := 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)

**Author**Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **67** of file **slamch.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man pages slamc3(3) and slamch(3) are aliases of slamch.f(3).

Tue Nov 28 2023 12:08:41 Version 3.12.0 LAPACK