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Re: Re: Making sense of Directive[ ]

  • To: mathgroup at
  • Subject: [mg75878] Re: [mg75813] Re: [mg75776] Making sense of Directive[ ]
  • From: DrMajorBob <drmajorbob at>
  • Date: Sat, 12 May 2007 03:13:58 -0400 (EDT)
  • References: <> <24009178.1178879881630.JavaMail.root@m35>
  • Reply-to: drmajorbob at

That's a good argument if List, dependably, will not appear where  
Directive COULD appear -- but that's hardly the case, is it? Not unless  
you personally wrote the code, wrote it SINCE Directive appeared on the  
scene, and never slipped up and forgot to use it.

I suspect examples will eventually be found, though, where List can't take  
the place of Directive.


On Fri, 11 May 2007 04:25:54 -0500, Murray Eisenberg  
<murray at> wrote:

> The docs give some good examples of one use of Directive: to avoid
> nested graphics directives.  Thus the example
>    Plot[{Sin[x],Cos[x]},{x,0,10},
>       PlotStyle->{Directive[Red,Dashed],Directive[Blue,Thick]}]
> from the "home page" of Directive, although wordier, is to my eye
> easier to read than the equivalent:
>    Plot[{Sin[x],Cos[x]},{x,0,10},
>       PlotStyle->{{Red,Dashed},{Blue,Thick}}]
> The longer and more numerous the directives are for the various elements
> of a plot or graphic, the more useful Directive becomes in untangling
> the syntax for the eye.
> Forex Ample wrote:
>> I stumbled upon the new Directive[ ] function, used to group Graphics
>> directives into one compound directive. However, I fail to see what it  
>> is
>> good for. In every example in the documentation, replacing Directive  
>> with
>> List seems to produce the exact same results. Anybody got a clue?
>> Greetz, Naz

DrMajorBob at

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