MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: How to roll up multiple Line calls into a loop

  • To: mathgroup at smc.vnet.net
  • Subject: [mg118354] Re: How to roll up multiple Line calls into a loop
  • From: roby <roby.nowak at gmail.com>
  • Date: Sat, 23 Apr 2011 07:52:22 -0400 (EDT)
  • References: <iorih5$o6t$1@smc.vnet.net>

On 22 Apr., 11:41, Sol Lederman <sol.leder... at gmail.com> wrote:
> Hi,
>
> I'm new to Mathematica.
>
> I have the following bit of graphics:
>
>    Graphics[{
>   Line[{{0, 10}, {1, 0}}],
>   Line[{{0, 9}, {2, 0}}],
>   Line[{{0, 8}, {3, 0}}],
>   Line[{{0, 7}, {4, 0}}],
>   Line[{{0, 6}, {5, 0}}],
>   Line[{{0, 5}, {6, 0}}],
>   Line[{{0, 4}, {7, 0}}],
>   Line[{{0, 3}, {8, 0}}],
>   Line[{{0, 2}, {9, 0}}],
>   Line[{{0, 1}, {10, 0}}],
>   }]
>
> I want to simplify it to do some sort of iteration to compute the end points
> of the lines. I can do this easily in a variety of procedural languages but
> I haven't yet grokked how Mathematica would do this.
>
> Would someone please show me the short way, I imagine using Table somehow?
>
> Thanks.
>
> Sol

first note that the very last "," should be removed.


then the following code should do what you want

In[17]:= Graphics[{Line[{{0, 10}, {1, 0}}], Line[{{0, 9}, {2, 0}}],
   Line[{{0, 8}, {3, 0}}], Line[{{0, 7}, {4, 0}}],
   Line[{{0, 6}, {5, 0}}], Line[{{0, 5}, {6, 0}}],
   Line[{{0, 4}, {7, 0}}], Line[{{0, 3}, {8, 0}}],
   Line[{{0, 2}, {9, 0}}], Line[{{0, 1}, {10, 0}}]}] //
 Cases[#, Line[{_, l_}] -> l, \[Infinity]] &

Out[17]= {{1, 0}, {2, 0}, {3, 0}, {4, 0}, {5, 0}, {6, 0}, {7, 0}, {8,
  0}, {9, 0}, {10, 0}}

Cheers Robert


  • Prev by Date: Re: How to create an animated gif (was: How to roll up
  • Next by Date: Re: How to roll up multiple Line calls into a loop
  • Previous by thread: Re: How to roll up multiple Line calls into a loop
  • Next by thread: Re: How to roll up multiple Line calls into a loop