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Re: Question about MeshFunctions (Plot function)
*To*: mathgroup at smc.vnet.net
*Subject*: [mg105086] Re: [mg105057] Question about MeshFunctions (Plot function)
*From*: Vicent <vginer at gmail.com>
*Date*: Fri, 20 Nov 2009 06:40:15 -0500 (EST)
*References*: <200911191024.FAA14695@smc.vnet.net>
On Thu, Nov 19, 2009 at 11:24, Vicent <vginer at gmail.com> wrote:
> I've tried this
>
> Plot[ f[x] , {x , 5 , 10} , Frame -> True , PlotRange -> { 2 ,
> 4 } , AspectRatio -> 1/GoldenRatio , PerformanceGoal -> "Quality"
> ,
> Mesh -> { { 0. } } , MeshFunctions -> { f1[#] & , f2[#] & } ,
> MeshStyle -> { Directive[ PointSize[ Large ] , Red ] , Directive[
> PointSize[ Large ] , Blue ] } ]
>
> and it works OK: it plots the curve for f[x] and marks (in my case)
> two points on it: one red and one blue, at the points where functions
> f1[x] and f2[x] take value 0.
>
> I could do the same with other different functions g[x], g1[x] and g2[x].
>
> But, is it possible to draw both curves in the same frame?? I don't
> know which is the proper syntax --I mean, this:
>
> Plot[ { f[x] , g[x] } , {x , 5 , 10} , Frame -> True ,
> PlotRange -> { 2 , 4 } , AspectRatio -> 1/GoldenRatio ,
> PerformanceGoal -> "Quality" ,
> Mesh -> { { 0. } } , MeshFunctions -> { { f1[#] & , f2[#] & }, {
> g1[#] & , g2[#] & } },
> MeshStyle -> { Directive[ PointSize[ Large ] , Red ] , Directive[
> PointSize[ Large ] , Blue ] } ]
>
> produces an error message. How can I get the kind of graphic I want?
>
Hello again.
I would like to make my question clearer, if possible.
I was not asking for this:
Plot[ { f[x] , g[x] } , { x , 5 , 10} , Frame -> True, PlotRange
-> {2, 4}, AspectRatio -> 1/GoldenRatio,
PerformanceGoal -> "Quality",
Mesh -> {{0}}, MeshFunctions -> {f1[#] & , f2[#] &}, MeshStyle ->
{Directive[PointSize[Large], Red], Directive[PointSize[Large],
Blue]}]
because I need the red and blue points to be defined in each curve (f
and g) by two different
pairs of functions f1, f2 and g1, g2. I mean, in my case, the
x-position (horizontal coordinate) of the red and blue
points could be different in curves f and g.
I've been told to previously compute the x-positions of the blue and
red point for each curve, and then put them in the graphic with
Epilog.
I am going to try it, but if you have different approaches, I would
like to know them.
Thank you in advance.
--
Vicent Giner-Bosch
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