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Re: A Question About Directive
*To*: mathgroup at smc.vnet.net
*Subject*: [mg111237] Re: A Question About Directive
*From*: "Kevin J. McCann" <Kevin.McCann at umbc.edu>
*Date*: Sat, 24 Jul 2010 05:09:08 -0400 (EDT)
*References*: <i293pl$m64$1@smc.vnet.net> <i2btc7$bcc$1@smc.vnet.net>
Mark,
I'll agree that your example with the use of the Inner product is a
clever way to do that, but isn't this way more readable?
Graphics[{
Red,PointSize[Large],Point[{0,0}],
Blue,PointSize[Medium],Point[{1,0}]
},
AspectRatio->1/10]
Seems like a lot of overhead with the use of Inner and Directive.
But if you prefer more keystrokes and the use of two additional
functions (Inner, Directive)
Graphics[
Inner[List, {
Directive[Red, PointSize[Large]],
Directive[Blue, PointSize[Medium]]
},
{Point[{0, 0}], Point[{1, 0}]},
List],
AspectRatio -> 1/10]
then have at it ;)
Kevin
Mark McClure wrote:
> On Thu, Jul 22, 2010 at 10:01 AM, Kevin J. McCann <Kevin.McCann at umbc.edu> w=
> rote:
>> A couple have responded with something like Mark's example below. Is this
>> really worth a new function and more keystrokes over:
>>
>> Plot[{Cos[x], Sin[x]}, {x, 0, 2 Pi},
>> PlotStyle -> {{Thick, Red}}]
>
>
> I still rather like Directive, primarily due to it's clarity. It
> certainly follows Wolfram's TypeExactlyWhatYouMean philosophy.
>
>>From a programmatic perspective, it can be convenient to encase
> directives in a head other than List. It makes it easier to use Cases
> or DeleteCases to scan for directives, for example.
>
> Here's an example where we use Inner to combine some graphics
> primitives and graphics directives. The fact that the head Directive
> is different from the head List is essential. I don't think you can
> change the Directive head to either a List or nested Lists.
>
> Graphics[
> Inner[List, {
> Directive[Red, PointSize[Large]],
> Directive[Blue, PointSize[Medium]]
> },
> {Point[{0, 0}], Point[{1, 0}]},
> List],
> AspectRatio -> 1/10]
>
> Of course, if you prefer Lists when appropriate, then have at it! :)
>
> Mark
>
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