Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.math.mathematica

Topic: Animate Command and Vector Reference
Replies: 1   Last Post: Jul 3, 2013 6:05 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View  
Bob Hanlon

Posts: 895
Registered: 10/29/11
Re: Animate Command and Vector Reference
Posted: Jul 3, 2013 6:05 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply


This is a scoping issue. The a used in the Animate iterator is local to the
Animate.


sub = {{a, 1}, {a^2, 1}};


Animate[
Graphics[{
Line[{{0, 0}, sub[[1]] /. a -> aa}]
}],
{{aa, -1, "a"}, -1, 1}]



Bob Hanlon


On Wed, Jul 3, 2013 at 4:59 AM, William Dickinson <
william.dickinson.0718@gmail.com> wrote:

> I'm new to Mathematica and I want to create some animations. I tried
> something like this:
>
> sub = {{a, 1}, {a^2, 1}}
> Animate[Graphics[{Line[{{0, 0}, sub[[1]]}]}], {a, -1, 1}]
>
> and Mathematica give me an error. This error ( Coordinate {a, 1} should be
> a pair of numbers, or a Scaled or Offset form.) is not helpful.
>
> I know that I can fix this by changing sub[[1]] to {a,1}, but this is not
> a great solution. I have several places in the actual Animate command that
> use sub[[1]] (some in conjunction with a Table command) and it would be
> painful to do all of the replacing and rewriting. How can I make something
> like this work?
>
> I suspect that I'm missing something simple....
>
>
> Thanks in advance!
>
> Will
>
>
>
>






Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.