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why an extra mark in legend?

• To: mathgroup at smc.vnet.net
• Subject: [mg106240] why an extra mark in legend?
• From: Haibo Min <haibo.min at gmail.com>
• Date: Wed, 6 Jan 2010 05:57:51 -0500 (EST)

Hello, everyone.

Suppose that I have attained a[t], b[t], c[t] in NDSolve.

s=NDSolve[...].

Then, I use

Plot[{a[t], b[t], c[t]} /. s // Evaluate, {t, 0, 20},  PlotRange -> {{0,
20}, {-2, 1}}, Frame -> True, Axes -> True,  FrameLabel -> {"Time(s)",
"value"},
 PlotStyle -> {{Red, Dashed, Thick}, {Blue, Thick}, {Black, Dotted, Thick}},
PlotLegend -> {"a", "b", "c"},  LegendPosition -> {0.5, -0.3}, LegendSize ->
{0.2, 0.3},
 LegendShadow -> None]

to plot. It was supposed to have three marks in the legend, but I got four,
where one of the marks had no text. Why?

Thanks.

Haibo

• Follow-Ups:
  • Re: why an extra mark in legend?
    • From: DrMajorBob <btreat1@austin.rr.com>