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Re: Just primitive ColorFunction

  • To: mathgroup at smc.vnet.net
  • Subject: [mg87361] Re: Just primitive ColorFunction
  • From: dh <dh at metrohm.ch>
  • Date: Tue, 8 Apr 2008 07:16:38 -0400 (EDT)
  • References: <ftfej7$bu7$1@smc.vnet.net>


Hi Jakub,

you may e.g. try:

Plot[Sin[x], {x, 0, 4 Pi}, Filling -> Axis,

  FillingStyle -> {Red, Blue}]

hope this helps, Daniel





?erých Jakub wrote:

> I think, that it must be something very simple, but I cannot find the

> solution....

> 

> I need to fill the Plot so, that area above the axis will be red and area

> below the axis will be blue. I tried it in a such way:

> 

> Plot[Sin[x], {x, 0, 4 Pi} ,

>  AxesOrigin -> {0, 0},

>  Axes -> {True, True},

>  PlotStyle -> Thick,

>  ColorFunction ->

>   If[Sin[x] >= 0, RGBColor[1, 0, 0], RGBColor[0, 0, 1]],

>  Filling -> Axis,

>  ImageSize -> {380, 280}]

> 

> But Mathematica says, that If is not a valid Color.

> 

> If I try it with Function (according to examples in ColorFunction help),

> 

> ColorFunction ->

>  Function[x, If[Sin[x] >= 0, RGBColor[1, 0, 0], RGBColor[0, 0, 1]]],

> 

> it is working, but the color of Filling is red allover the range.

> 

> Thanks for any hint, how to achieve the +Red/-Blue filling.

> 

> Jakub

> 

> 




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