The UseHardwareFloats Environment Variable - Maple Programming Help

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The UseHardwareFloats Environment Variable

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

UseHardwareFloats := flag

Parameters

flag

-

true, false, or deduced

Description

• 

The UseHardwareFloats environment variable controls whether Maple's hardware or software floating-point computation environment is used to perform floating-point operations when there are hardware floating-point values present in the expression being evaluated.

• 

This environment variable has influence only over computations done on expressions containing hardware floats (see HFloat) or hardware floating-point rtables (Arrays, Matrices and Vectors; see rtable).

• 

The setting of UseHardwareFloats is also honored inside procedures that have option hfloat.

• 

The default value of UseHardwareFloats is deduced. The value deduced tells Maple to deduce the computation environment (hardware or software) from the current setting of the Digits environment variable: if Digits <= evalhf(Digits), then hardware float computation is allowed; otherwise, the computation is performed using software floats.

• 

If UseHardwareFloats is set to true, hardware float computation is always allowed (so long as the expression contains hardware floating-point values of rtables of such, or the expression appears within a procedure having option hfloat).

• 

A false setting of UseHardwareFloats disallows hardware floating-point computations in all contexts except within the evalhf environment. Any hardware float values appearing in expressions are first converted into software floats before operations are performed.

• 

The value of UseHardwareFloats can be  changed by using the assignment operator.

Examples

UseHardwareFloats&comma;Digits

deduced&comma;10

(1)

sinHFloat1.0

0.841470984807897

(2)

Digits25&colon;

sinHFloat1.1

0.8912073600614353807754535

(3)

UseHardwareFloatstrue&colon;

sinHFloat1.2

0.932039085967226

(4)

Digits10&colon;

UseHardwareFloatsfalse&colon;

sinHFloat1.3

0.9635581854

(5)

See Also

assignment

Digits

environment variables

evalhf

HFloat

option_hfloat

rtable

 


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