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? > >