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Re: TraceInternal and OptionQ


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






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