Bug in legend_label of list_plot?

list_plot

asked 2012-11-10 23:44:35 +0100

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Hi, Suppose lstR and lstS are two lists of real numbers.

X = list_plot(lstR, plotjoined = True, color='black', marker = 'o', linestyle="-", legend_label='$R$', axes_labels=['Trial number', 'Value'])
Y = list_plot(lstS, plotjoined = True, color='black', marker = 's', linestyle="--", legend_label='$S$', axes_labels=['Trial number', 'Value'])      
(X+Y).show()

The legend label for R is two squares joined by a line instead of two circles joined by a line. Is this a bug? (I am unable to upload the plot image because my karma is not > 60.)

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On the other hand, `(X+Y).save('tmp.eps')` displays the legend labels correctly.

Iftikhar Burhanuddin ( 2012-11-11 00:41:27 +0100 )edit

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answered 2012-11-12 00:09:46 +0100

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I recently filed a bug report on this. Problem seems somewhere in sage. It's hard to figure out where :( The problem is only in the marker type 'o'; the other marker types work just fine. So, simply avoid 'o'!

See: http://trac.sagemath.org/sage_trac/ti...

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We just realized that the upgrade to matplotlib 1.2.0 fixes this issue. See the trac ticket above for discussion.

Jason Grout ( 2012-11-12 10:28:47 +0100 )edit

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answered 2012-11-11 00:32:13 +0100

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Yes, it is a bug. Thanks for posting about this!

Here is a minimal example showing that the real problem is that if marker='o', then the legend shows a square while the graph shows a circle.

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How do I circumvent this bug to get the legend labels right?

Iftikhar Burhanuddin ( 2012-11-11 00:37:55 +0100 )edit

It looks like things work well if you avoid `marker='o'`

Jason Grout ( 2012-11-11 00:43:45 +0100 )edit

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