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

**References**:**Question about MeshFunctions (Plot function)***From:*Vicent <vginer@gmail.com>