= or := in MP

= or := in MP

[Matthew Huggett]

Hello:

What exactly is the difference between using   u = 2cm   and   u := 2cm ?
If I have multiple figures in a file, and I re-define u with u=someValue in
subsequent figures, MP often complains about the value being re-defined.  If
I use := there's no trouble.  When is it correct to use = and when := ?

By the way, is it o.k. to post MP questions here or should I be looking
somewhere else?

Thanks and Best Wishes,

Matthew

RE: = or := in MP

[Martin Kola?ik]

Hello,

as far as I know MP uses := for setting value ("assign" statement), whereas
= for defining symbolic relationship between left and right side of =. Said
in other way, using = defines linear equation.

MP has internal mechanism to solve linear equations (and systems of linear
equations). So, if you write

a1+ b1 = 14
a1- b1 = -5

you immediately can use values of a1 and b1 without numerically defining
them.

And u = 2cm? This is a linear equation, where is nothing to solve.

Have a nice day,

Martin

--------
Martin Kolarik
Moravske Pristroje, a.s., Masarykova 1148, Zlin 76302
tel. +420(603)498498, fax +420(603)490803
web: http://www.mii.cz
--------
e-mail: kolarik@mii.cz
e-mail: kolarik@click.cz
tel. +420(603)535593

> -----Original Message-----
> From: owner-ntg-context@let.uu.nl [mailto:owner-ntg-context@let.uu.nl]On
> Behalf Of Matthew Huggett
> Sent: Friday, September 13, 2002 3:48 AM
> To: ntg-context@ntg.nl
> Subject: = or := in MP
>
>
> Hello:
>
> What exactly is the difference between using   u = 2cm   and   u := 2cm ?
> If I have multiple figures in a file, and I re-define u with
> u=someValue in
> subsequent figures, MP often complains about the value being
> re-defined.  If
> I use := there's no trouble.  When is it correct to use = and when := ?
>
> By the way, is it o.k. to post MP questions here or should I be looking
> somewhere else?
>
> Thanks and Best Wishes,
>
> Matthew
>
>

Re: = or := in MP

[Hans Hagen]

At 10:48 AM 9/13/2002 +0900, Matthew Huggett wrote:

>By the way, is it o.k. to post MP questions here or should I be looking
>somewhere else?

sure,

Hans
-------------------------------------------------------------------------
                                   Hans Hagen | PRAGMA ADE | pragma@wxs.nl
                       Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
  tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com
-------------------------------------------------------------------------
                        information: http://www.pragma-ade.com/roadmap.pdf
                     documentation: http://www.pragma-ade.com/showcase.pdf
-------------------------------------------------------------------------