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MathGroup Archive 2005

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Re: Do loops in Mathematica

  • To: mathgroup at
  • Subject: [mg55184] Re: [mg55170] Do loops in Mathematica
  • From: Bob Hanlon <hanlonr at>
  • Date: Wed, 16 Mar 2005 05:35:59 -0500 (EST)
  • Reply-to: hanlonr at
  • Sender: owner-wri-mathgroup at

Do[p = x /. Solve[x^2+3*x+1 == 0, x]; Return[2p], {i, 1}]

{-3 - Sqrt[5], -3 + Sqrt[5]}

Bob Hanlon

> From: "dumb_founded" <andreajagger_8 at>
To: mathgroup at
> Date: 2005/03/15 Tue AM 12:22:03 EST
> To: mathgroup at
> Subject: [mg55184] [mg55170] Do loops in Mathematica
> I am having trouble setting up Do loops in Mathematica.  Even when I
> put in a return statement, I get no output.  Below is a concrete
> example of code I am putting in:
> Do[{p = Solve[x^2 + 3*x + 1 == 0, x], Return[2*p]}, {i, 1}]
> I get nothing out of it.
> Here is a sketch of the code I want to construct but am scared to
> because of the above problem I keep encountering.
> (1) the first expression in the Do loop calls the FindRoot function on
> nonlinear function of x that involves a constant c.  The constant c is
> in curly brackets at the end of the Do loop specifying a beginning
> value for c and an ending value for c.
> (2) I take the root found in the previous expression and I use it to
> calculate two numerical integrals
> (3) I add or subtract the two numerical integrals found in the previous
> expressions and I return the value of this expression (and this
> expression alone).
> I am having a headache figuring out this simple chore.  Mathematica
> simply refuses to behave.

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