Re: decrementing problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg72315] Re: [mg72293] decrementing problem*From*: János <janos.lobb at yale.edu>*Date*: Tue, 26 Dec 2006 04:51:04 -0500 (EST)*References*: <200612181156.GAA02194@smc.vnet.net>

On Dec 18, 2006, at 6:56 AM, jltrahan at mail.usf.edu 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 My newbie thinking is that your test in the first For loop is evaluating to False right away. i<=1 In the first step i is 4. The question is if 4 is less than or equal to 1. That is False right away, so that loop ends and does not enter into the second loop at all. With the best, János

**References**:**decrementing problem***From:*jltrahan@mail.usf.edu