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Topic: Color according to concavity
Replies: 1   Last Post: Dec 3, 2012 3:30 AM

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Sergio Miguel Terrazas Porras

Posts: 42
Registered: 6/16/05
Re: Color according to concavity
Posted: Dec 3, 2012 3:30 AM
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Thank you, Bob and Murray.

Desde: Bob Hanlon [hanlonr357@gmail.com]
Enviado el: jueves, 29 de noviembre de 2012 09:52 a.m.
Hasta: Sergio Miguel Terrazas Porras
CC: mathgroup@smc.vnet.net
Asunto: Re: Color according to concavity

f[x_] = Sin[x] Cos[2 x];

Plot[f[x], {x, 0, 4 Pi},
ColorFunction -> Function[{x, y},
If[f''[x] < 0, Red, Blue]],
ColorFunctionScaling -> False]

Bob Hanlon

On Thu, Nov 29, 2012 at 6:04 AM, Sergio Miguel Terrazas Porras
<sterraza@uacj.mx> wrote:
> Dear fellows at mathgroup:
> I want to plot a function with the color of the parts of the curve accord=

ing to concavity, say Red when concve down an blue when concave up.
> I can do it by brute force, finding whwn the second derivative is cero, a=

nd then finding the sign of it in the different intervals, etc. This for pa=
rticular examples.
> But, is there a way to use the second derivative as part of a ColorFuncti=

on, or something like that?
> Thanks

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