Re: Draw two functions in a graph, one of them does also

*To*: mathgroup at smc.vnet.net*Subject*: [mg90194] Re: [mg90176] Draw two functions in a graph, one of them does also*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Wed, 2 Jul 2008 05:28:26 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <200807011101.HAA15055@smc.vnet.net>*Reply-to*: murray at math.umass.edu

First of all, you don't have two functions of x: you have the function f of x and then you have a function of two variables a and x. I presume you wish to treat a as a parameter in g. Second, you don't have Mathematica syntax for the two functions! Here's one way: f[x_] := -x^2 + 6 x g[a_][x_] := a x Plot[{f[x], Table[g[a][x], {a, 0, 3}]}, {x, 0, 1}] Add an option if you wish that makes the zero function (when a==0) be more visible: Plot[{f[x], Table[g[a][x], {a, 0, 3}]}, {x, 0, 1},PlotStyle->Thick] That plots f in one color and the several g[a] in a second color. If you want automatic coloring with more than two colors, you could do this: Plot[Evaluate@{f[x], Table[g[a][x], {a, 0, 3}]}, {x, 0, 1}] (I don't know why the Evaluate does this!) Another approach is to treat g as a function of two variables: Clear[g] g[a_,x_]:=a x And then: Plot[{f[x], Table[g[a, x], {a, 0, 3}]}, {x, 0, 1}] Felipe Mannshardt wrote: > Is there a way to do a Plot do draw this two functions in the same graph ? > I am asking because i am having problems due the parameter "a". > > I have, > > f(x)= -x^2 + 6x > g(x)= ax > > i want to draw them in the same graphic and with a from 0 to 3 . . . > > Can not think of a way of doing this, due the "a" parameter . . . > > Plot[{f[x],[g[a][x]},{x,0,7},{a,0,3}] > > > Can some help me out with this small issue ? > > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**Draw two functions in a graph, one of them does also have a parameter.***From:*Felipe Mannshardt <vexie.infamous@googlemail.com>