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Re: mathematica newbie ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92427] Re: mathematica newbie ?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Tue, 30 Sep 2008 21:50:54 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <gbt2pe$lcc$1@smc.vnet.net>

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.

Assuming I have correctly understood the pseudo-code, a possible 
solution is as follows:

     In[1]:= nsupports = 3;
             ndof = 10;
             nels = 2;
             int = Range[0, nsupports - 1];
             Table[If[x == 0, 0, If[x == nsupports - 1, ndof - 2,
               x*nels*2]], {x, int}]

     Out[20]= {0, 4, 8}

Regards,
-- Jean-Marc


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