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Re: A Question About Directive

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  • Subject: [mg111140] Re: A Question About Directive
  • From: "Kevin J. McCann" <Kevin.McCann at>
  • Date: Thu, 22 Jul 2010 05:39:34 -0400 (EDT)
  • References: <i23k7a$f1f$>

Thanks Murray. I understand, but that seems like very little improvement 
at the cost of a new function. Surely, there must be more. BTW, I think 
I like the old way better - fewer keystrokes, and I am old fashioned ;)


Murray Eisenberg wrote:
> In some situations, using Directive[opt1,opt2] instead of {opt1,opt2} 
> can make code easier to read by avoiding nested parentheses.
> Compare, for example:
>    Plot[{Sin[x],Cos[x]},{x,0,Pi},PlotStyle->
>       {Directive[Thick,Red],Directive[Thick,Dashed,Blue]}]
>    Plot[{Sin[x], Cos[x]}, {x, 0, Pi},
>        PlotStyle -> {{Thick, Red}, {Thick, Dashed, Blue}}]
> On 7/19/2010 2:10 AM, Kevin J. McCann wrote:
>> I have noticed the use of Directive in some of the graphics examples
>> from Bob Hanlon, David Park, and others. I am curious about this
>> command, since it does not appear to do much that is new. For example,
>> here is an example from the Help on Directive:
>> Graphics[{Directive[Red, Thick], Circle[],
>>     Directive[Blue, Opacity[0.5]], Rectangle[{0, -1}, {2, 1}]}]
>> However, if I change to this, I get the same thing:
>> Graphics[{Red, Thick, Circle[], Blue, Opacity[0.5],
>>     Rectangle[{0, -1}, {2, 1}]}]
>> So, what is the benefit of Directive?
>> Thanks,
>> Kevin

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