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MathGroup Archive 2006

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Re: Plotting a function -

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71654] Re: Plotting a function -
  • From: "mumat" <csarami at gmail.com>
  • Date: Sun, 26 Nov 2006 03:48:35 -0500 (EST)
  • References: <ek990u$k88$1@smc.vnet.net>

what do you mean by having a "3" in them? Do you mean 3 be a digit in
the decimal representation of x?

Maybe this one work!!

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

The graph looks like a graph of a piece-wise defined function.

chekad



On Nov 25, 6:22 am, Craig Reed <tharkun... at publicspam.com> wrote:
> 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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