Re: Expressing values in the legend in terms of original data
- To: mathgroup at smc.vnet.net
- Subject: [mg92573] Re: Expressing values in the legend in terms of original data
- From: "sjoerd.c.devries at gmail.com" <sjoerd.c.devries at gmail.com>
- Date: Mon, 6 Oct 2008 04:13:53 -0400 (EDT)
- References: <gbvlva$bdf$1@smc.vnet.net>
In addition to my previous reply I should have taken the automatic
ranging of ContourPlot into account as it scales values to give a 0..1
range.
So, if you want to make sure the legend maps GrayLevels 0..1 to the
-2..2 range (in case the ends of this range are not within the plot
region) you have to adjust the scaling of ContourPlot accordingly:
contourPlotFun =
ContourPlot[
2 Sin[x y], {x, -\[Pi]/2, \[Pi]/2}, {y, -\[Pi]/2, \[Pi]/2},
ColorFunctionScaling -> False,
ColorFunction -> (GrayLevel[1 - ((# + 2)/4)] &)];
ShowLegend[contourPlotFun, {GrayLevel[1 - #] &, 10, " 2", "-2",
LegendPosition -> {1.1, -.4}, LegendShadow -> None}]
Cheers -- Sjoerd
On Oct 1, 1:12 pm, er <erwann.rog... at gmail.com> wrote:
> Hi,
>
> Considering
>
> contourPlotFun=
> ContourPlot[2 Sin[x y],{x,-\[Pi]/2,\[Pi]/2},{y,-\[Pi]/2,\[Pi]/2},
> DisplayFunction\[Rule]Identity];
>
> ShowLegend[
> contourPlotFun,{GrayLevel[1-#]&,10," 1","-1",
> LegendPosition\[Rule]{1.1,-.4}}];
>
> The legend here is misleading, because the min and max values are -2
> and 2, respectively, not -1 and 1. So how can I modify the input to
> ShowLegend to reflect that?
>
> Thanks!