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Re: Why the loop gain no result?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126082] Re: Why the loop gain no result?
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Sun, 15 Apr 2012 03:19:01 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <jmb7v4$r2e$1@smc.vnet.net>

On Apr 14, 12:11 am, Huafeng Cao <geotom.... at gmail.com> wrote:
> I use the 'For' loop to solving an equation, such as :
>     For[i = 1, i < 5, i++, a = i; Solve[a*x^2 - 2 x + 1 == 0, x]].
> The 'a' in the body must be updated in every loop with the 'i'.
> But i can't gain the result, Somewhere is disorder? I am confused.

No, you don't need the 'a'. But if you want to see the results
then you need to Print them:
  For[i = 1, i < 5, i++, Print@Solve[i*x^2 - 2 x + 1 == 0, x]]
or put them in a Table:
  Table[Solve[i*x^2 - 2 x + 1 == 0, x], {i,4}]



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