Using the java.lang.Math with different VM

Thread view:

Kasper K - 12 Mar 2004 11:09 GMT

Hi there,

Does anyone know if java.lang.Math is robust when used with multiple
Virtual Machines? That is does the sin, cos, tan and atan return the
exact same double values when given same double arguments on all VM
including MS VM 1.1.8 to Sun VM 1.4.2?

I think it does not based on testing it. Does anyone have a suggestion
of how to get around this problem? I am making a Bob-Game that relies
on that the server and clients getting the same results. Does there
exist a Math library that is VM and hardware independent e.g. using
look up tables.

/Kasper - Denmark

Reply to this Message

Boris Stumm - 12 Mar 2004 12:12 GMT

> Does anyone know if java.lang.Math is robust when used with multiple
> Virtual Machines? That is does the sin, cos, tan and atan return the
> exact same double values when given same double arguments on all VM
> including MS VM 1.1.8 to Sun VM 1.4.2?

For that, there is java.lang.StrictMath

Reply to this Message

Kasper K - 15 Mar 2004 12:45 GMT

> > Does anyone know if java.lang.Math is robust when used with multiple
> > Virtual Machines? That is does the sin, cos, tan and atan return the
> > exact same double values when given same double arguments on all VM
> > including MS VM 1.1.8 to Sun VM 1.4.2?
>
> For that, there is java.lang.StrictMath

Yes that is true but it is only supportet by 1.3 and above. Does
anyone know of a library that can be used from 1.1.8?

/Kasper - Denmark

Reply to this Message

Roedy Green - 16 Mar 2004 00:25 GMT

>Yes that is true but it is only supportet by 1.3 and above. Does
>anyone know of a library that can be used from 1.1.8?

Early versions were all strict if that is of any help.

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

Reply to this Message

Using the java.lang.Math with different VM

Free Magazines