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MathGroup Archive 2007

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Coaxing N[] to work

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73370] Coaxing N[] to work
  • From: <p at dirac.org>
  • Date: Wed, 14 Feb 2007 05:20:58 -0500 (EST)

Sometimes N[,] doesn't appear to work.  Like here:


x = {2.0, 3.0, 5.0};
A = { {6.0, 2.0, 1.0}, {2.0, 3.0, 1.0}, {1.0, 1.0, 1.0} };
For[ k=0, k<15, ++k,
   lambda = x.A.x/(x.x);
   y = LinearSolve[A,x];
   x = y / Norm[y,Infinity];
]
N[lambda, 30]


The output is:

   Out[5]= 0.578933

I was expecting 30 digits.  Why did N[] ignore my request for 30 digits?


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