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Re: mathematica newbie ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92439] Re: [mg92376] mathematica newbie ?
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Tue, 30 Sep 2008 21:53:10 -0400 (EDT)
  • Organization: Mathematics & Statistics, Univ. of Mass./Amherst
  • References: <200809301133.HAA21913@smc.vnet.net>
  • Reply-to: murray at math.umass.edu

To begin, I hardly thing there's any difficulty whatsoever in the stated 
case where nsupports=3, since you have then a list of just 3 elements. 
so let's try something a little more ambitious, where there are, say 6 
elements:

   nsupports = 6; ndof = 10; nels = 2;

Next, define a function v having two special rules and one general rule:

   v[0] = 0; v[nsupports - 1] = ndof - 2;
   v[x_] := 2 x nels

Finally, form the column vector you want:

   col = Table[{v[x]}, {x, 0, nsupports - 1}]
{{0},{4},{8},{12},{16},{8}}

The result is, in effect, a column vector -- although it's really just a 
list of 6 one-element lists.  If you want to display it as a column 
vector, do this:

   col // MatrixForm



Jared.webb at yahoo.com wrote:
> I am extremely new to mathematica and am having trouble following the
> documentation.
> 
> I would like to set up the following loop and have it send the output
> to a vector.
> 
> If I have in mathematica:
> 
> nsupports=3
> ndof=10
> nels=2
> int=range[0,nsupports-1]        - this is my iterator
> 
> I want to set up a loop:
> 
> for x in int:
> if x=0, return 0
> if x=nsupports-1, return ndof-2
> otherwise, return x*nels*2
> 
> I want the output to go to a column vector.
> 
> Thanks
> Jared
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305


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