Re: TraceInternal and OptionQ
- To: mathgroup at smc.vnet.net
- Subject: [mg9029] Re: [mg8949] TraceInternal and OptionQ
- From: Allan Hayes <hay at haystack.demon.co.uk>
- Date: Wed, 8 Oct 1997 00:05:26 -0400
- Sender: owner-wri-mathgroup at wolfram.com
Olivier Gerard <jacquesg at pratique.fr>
Re: [mg8949] TraceInternal and OptionQ
> But can you give us a simple example were a
> RuleDelayed is necessary in an option for a standard
> Mathematica function ?
Oliver:
I'm sure that there are better examples, but:
gr1=Show[Graphics[{Circle[{0,0},1]}], PlotLabel -> "This font",
DefaultFont->$DefaultFont];
gr2=Show[Graphics[{Circle[{0,0},1]}], PlotLabel -> "This font"];
$DefaultFont = {"Helvetica",24.};
Show[gr1] (*used default Courier font*)
Show[gr2] (*used default new Helvetica font*)
$DefaultFont={"Courier",10.}; (*restore original*)
Allan Hayes
hay at haystack.demon.co.uk
http://www.haystack.demon.co.uk/training.html
voice:+44 (0)116 2714198
fax: +44 (0)116 2718642
Leicester, UK