Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: Color according to concavity
Posted:
Dec 3, 2012 3:30 AM


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 > >=



