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I am using ListPlot to plot many lines in the same graph. I want to put in a legend but only for a subset of these lines. For example

ListPlot[{P1,P2,P3,P4},PlotLegend -> {"a","b"}]

where P1,P2,P3,P4 are some lists that one can plot, however this creates a legend for -all- plots P1,...,P4, with empty texts for some of them. How can I make a legend that only lables two of the lines?

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  • $\begingroup$ Perhaps Show[{ListPlot[{P1,P2}, PlotLegend->{"a", "b"}], ListPlot[{P3,P4}]}] including PlotRange if needed. $\endgroup$ – Bill Oct 28 '15 at 1:21
  • $\begingroup$ You mean PlotLegends, not PlotLegend. $\endgroup$ – Verbeia Oct 28 '15 at 1:27
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    $\begingroup$ @Verbeia: He may really be using the old PlotLegends package -- it had the syntax and behavior described. $\endgroup$ – Brett Champion Oct 28 '15 at 2:14
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Works for me

{p1, p2, p3, p4} = 
 Accumulate /@ RandomVariate[NormalDistribution[0, 1], {4, 50}];


ListLinePlot[{p1, p2, p3, p4}, PlotLegends -> {"a", "b"}]

enter image description here

What version of Mathematica are you using?

ListPlot works fine, though of course by default you get dots not an unbroken line.

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    $\begingroup$ Same result for v9 $\endgroup$ – Dr. belisarius Oct 28 '15 at 1:51
  • $\begingroup$ Actually I was using PlotLegend, which gives the behaviour I described (and no error message). With PlotLegends it works fine now. $\endgroup$ – Jonathan Lindgren Oct 28 '15 at 16:02
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    $\begingroup$ But what is the syntax if he only wanted to label, for example, P1 and P4? Without using the Show function.. $\endgroup$ – niq Oct 10 '16 at 17:10
  • $\begingroup$ This is trivial. What if one wants to have the legends just for e.g. P1 and P4? $\endgroup$ – KratosMath Aug 27 at 8:51

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