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MathGroup Archive 2006

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Plotting a function -

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71642] Plotting a function -
  • From: Craig Reed <tharkun860 at publicspam.com>
  • Date: Sat, 25 Nov 2006 05:37:25 -0500 (EST)

Hi -

I'm trying to get Mathematica 5.2 to graph a function which is the ratio of 
integers which have a '3' in them. Done in Exce3l, the graph of the first 
32,000 data points has a fractal look to it, especially when done with a 
log scale.

What I've tried is the following


f[x_] := Boole[DigitCount[x, 10, 3]]
g[x_] := Sum[f, {i, x}]/x
Plot[g, {x, 1, 100}]


I get 3 errors of "g is not a michine-size real number at" followed by 3 
real numbers:
1.000004125
5.016125.....
9.39607.....

What am I doing wrong?  or perhaps what I should ask is, "Is there a better 
way?"


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