[Rd] vignette optional sections.

[Paul Gilbert]

I am writing a vignette that can run certain things on some systems but 
needs to skip them on other systems. (Some sections need databases that 
will not always be available.) Wrapping things in an if(){} partly 
works. It gives fairly ugly examples and all printing gets delayed until 
the end of the if.  However, if the block produces a graphic, and I have 
{fig=TRUE} so in the case where the database is available the graphic is 
included in the vignette pdf, then the pdf generation fails in the case 
where the graphic is not produced.

Does anyone have suggestions for a nice solution to this?

Thanks,
Paul Gilbert
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La version française suit le texte anglais.

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