Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

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?

• Follow-Ups:
  • Re: Coaxing N[] to work
    • From: "Igor C. Antonio" <igora@wolf-ram.com>
  • Re: Coaxing N[] to work
    • From: Sseziwa Mukasa <mukasa@jeol.com>