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MathGroup Archive 2007

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Re: Problem with PlotLegend in Mathematica 6.0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg77995] Re: Problem with PlotLegend in Mathematica 6.0
  • From: dh <dh at metrohm.ch>
  • Date: Thu, 21 Jun 2007 05:38:17 -0400 (EDT)
  • References: <f5atgq$apg$1@smc.vnet.net>


Ho peter,

Your first example will not work on any mathematica version prior to 6. 

The reason is that Plot has the attribute HoldAll. Therefore what is fed 

to Plot is: fn. This will not evaluate on prior versions because the 

localized x from Plot and the global x from fn are different variables 

and Plot will complain. There seems to have been a (may be dangerous 

because of lozalitation) change in the implementation of Plot, but there 

seems stiil to exist some hickups. A way out is to overwrite the HoldAll 

by: Plot[Evaulate[fn],...]

hope this helps, Daniel



peter.steneteg at gmail.com wrote:

> I can not figure out why I get different results for these two cases.

> 

> Needs["PlotLegends`"]

> fn = {Sin[x], Cos[x]}

> Plot[fn, {x, 0, 2 Pi}, PlotLegend -> {"sin", "cos"}]

> Plot[{Sin[x], Cos[x]}, {x, 0, 2 Pi}, PlotLegend -> {"sin", "cos"}]

> 

> When i use Plot[fn,... the Legend will only show one line, "sin" but

> if I use the later case with Plot[{Sin[x],Cos[x]},... the Legend will

> show correctly. Does anyone have any idea why this happens. And if

> there are any solution?

> 

> 




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