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Re: How to get Tooltip value

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112878] Re: How to get Tooltip value
  • From: Simon <simonjtyler at gmail.com>
  • Date: Tue, 5 Oct 2010 03:05:01 -0400 (EDT)
  • References: <i8c8rl$g73$1@smc.vnet.net>

On Oct 4, 9:04 pm, "James Brown" <J... at SETI.Net> wrote:
> Is there  a way to extract the value of a variable and display it with
> Tooltip?
> Example:
> f[x_] := 1/x^2
> Plot[Tooltip[f[x],"Value of x is:" "(wish I knew)"],{x,0,100}]
>
> Thanks... Jim

Here's an ugly hack:

f[x_] := 1/x^2
p = Plot[f[x], {x, 0, 100}];
data = p[[Sequence @@ Position[p, Line[__]][[1]]]][[1]];
ListPlot[Tooltip[#, #] & /@ data, Joined -> True]

But there are probably nicer solutions (eg use a locator constrained
to the curve that follows the mouse that dynamically returns the
position...)

Simon


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