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Re: Simplifying expressions containing units

• To: mathgroup at smc.vnet.net
• Subject: [mg19918] Re: [mg19894] Simplifying expressions containing units
• From: "David Park" <djmp at earthlink.net>
• Date: Tue, 21 Sep 1999 02:22:50 -0400
• Sender: owner-wri-mathgroup at wolfram.com

Christian wrote:

>Hello!
>
>Is it possible to simplify the expression
>
>4 Newton/2 Kilogram
>
>to yield Meter/Second^2?
>
>Mathematica just outputs
>
>2 Newton/Kilogram
>
>
>Of course it is possible to Convert it using
>
>Convert[%,Meter/Second^2],
>
>but that's only possible, if I know, what's coming out at the end of the
>caculation. It would be nice if Mathematica itself would take care of using
>appropriate "versions" of the different derived SI-units.
>
>Any solutions?
>
>Christian Gudrian
>

Christian,

There is an ExtendUnits package, available at my web site below, which contains many
routines for using units. One routine is BaseSI which converts all units to base SI
units.

<< Miscellaneous`V4ExtendUnits`
4 Newton/(2Kilogram) // BaseSI
(2*Meter)/Second^2

The package also allows: simultaneous conversion to multiple compatible units;
conversion to descending compatible units; use of a PrefixForm format which
automatically picks the proper SI prefix on output; controlled deunitizing of
expressions for numerical work with specified implied units; installation of user
defined units which work like the regular units; implementation of reduced unit
systems such as geometrized units or atomic units.

David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/