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Re: Plotting/Inflection Point

  • To: mathgroup at
  • Subject: [mg26002] Re: Plotting/Inflection Point
  • From: "A. E. Siegman" <siegman at>
  • Date: Wed, 15 Nov 2000 02:09:50 -0500 (EST)
  • Organization: Stanford University
  • References: <8ur0e1$>
  • Sender: owner-wri-mathgroup at

In article <8ur0e1$qta at>, bobmarley4u2c at wrote:

> If I have a polynonial: f(x)=2x^3-3x^2-12, and I found that the
> Inflection Point is: (.5,-6.5). I want to plot the function and, show
> where the inflection point is by labeling it on the plot. How can I do
> that?

Assuming you know the coordinates of the point you want to mark, 
something like:

   Show[Plot[x^2,  {x, 0, 1},  DisplayFunction -> Identity], 
            Graphics[{PointSize[0.02],  Point[{1/2, 1/4}]}], 
            DisplayFunction -> $DisplayFunction]

will put a larger dot on the selected point.  (You can of course write 
the Plot and Graphics statements as separated named expressions, then 
put the names into Show.)

To put a text label near this point, read about (or bring up the Help 
message) for

   Text[expr, coords, offset]

which will easily do the job.

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