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Re: decrementing problem

  • To: mathgroup at
  • Subject: [mg72309] Re: decrementing problem
  • From: "Philipp" <Philipp.M.O at>
  • Date: Tue, 26 Dec 2006 04:54:11 -0500 (EST)
  • References: <em60nv$3ar$>

For the first For loop to work n needs to be less or equal to 2 (n <=
2). Even then the loop becomes infinite, which, I am sure, was not your

Besides getting your conditions for indices right, you should also
revise where you put the  summ=0 statement; as it is now, the  summ is
set to 0 before every inside For.


jltrahan at wrote:
> Hi,
> I am having a really difficult time with decrementing values in my For
> loop. I have tried i--, --i, i-=1, i=i-1, and nothing is working. The loop
> is as follows:
> For[i=n-1, i<=1, i--, summ=0;
>    For[j=i+1, j<=n, j++, summ=summ + U[[i,j]]*X[[j]]]
> ]
> When I try to print i or j, nothing shows up.
> Can anyone please help?
> Thank you in advance,
> Jamie

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