RE: Mathematica 6.0 - Legend

*To*: mathgroup at smc.vnet.net*Subject*: [mg75942] RE: [mg75861] Mathematica 6.0 - Legend*From*: "David Annetts" <davidannetts at aapt.net.au>*Date*: Mon, 14 May 2007 03:26:03 -0400 (EDT)*References*: <200705120704.DAA23845@smc.vnet.net>

Hi Robert, > I want to create a Legend on a ListLinePlot I made. I have > 4 data groups I plot on one graph and I want to identify each > one by its colour and a name. > > I read about the Legend Package, but it seems, if I > understand correctly, to work only with Plot like graphs. I > do not understand why it is so difficult (it seems to me > anyway) to add a legend to a graph. It is common practice in > science to identify a plot with a legend, so others can > understand your graphics. With the Plot command it seems > straight forward to do this with PlotLegend (mind you I do > not see how I can move the legend around...). Why this > package is not available with all other graphics tools, like > ListPlot, ListLinePlot,.... > > > > Or maybe it is just me ... J It might just be you ....:) For 5.2 and earlier, Legends can be moved using the directive LegendPosition->{x, y}. For other plotting commands, Legends can be used with the command ShowLegend. It's tedious, but not particularly difficult. I hope that Legend use with 6.0 is much less tedious. Anyway, given data = Random[] & /@ Range[32]; p1 = ListPlot[data]; We can define a line using lin = {Graphics[Line[{{-1, 0}, {0, 0}}]]}; And a legend using lgd = {Transpose[{lin, {"Legend"}}], LegendLabel -> StyleForm["Label", FontWeight -> "Bold"], LegendOrientation -> Vertical, LegendSize -> {.4, .2}, LegendShadow -> .01, LegendPosition -> {-.2, -.95} }; We use them together with ShowLegend[] as ShowLegend[p1, lgd]; The tedium comes when trying to position the legend, but the two positions below should get you started. LegendPosition -> {-.8, .35} (* top left *) LegendPosition -> {.5, -.5} (* bottom right *) For graphs of more than one data set, you'll need muliple Legend entries, for example, given data = {Random[], Random[]} & /@ Range[32]; data = Transpose[data]; p1 = MultipleListPlot[data, PlotStyle -> {Red, Blue}, SymbolShape -> None]; One Legend might be lin = Graphics[{#, Line[{{-1, 0}, {0, 0}}]}] & /@ {Red, Blue}; lgd = {Transpose[{lin, {"Curve 1", "Curve 2"}}], LegendLabel -> StyleForm["Comparison", FontWeight -> "Bold"], LegendOrientation -> Vertical, LegendSize -> {.4, .2}, LegendShadow -> .01, LegendPosition -> {.5, -.5} }; ShowLegend[p1, lgd]; Regards, Dave.

**References**:**Mathematica 6.0 - Legend***From:*Robert Pigeon <robert.pigeon@videotron.ca>