Re: Possible bug in Opacity[] with plotting function that uses UnitStep?
- To: mathgroup at smc.vnet.net
- Subject: [mg105605] Re: Possible bug in Opacity[] with plotting function that uses UnitStep?
- From: Yves Klett <yves.klett at googlemail.com>
- Date: Fri, 11 Dec 2009 04:17:07 -0500 (EST)
- References: <hfqgmj$ol0$1@smc.vnet.net>
Hi, Directive[___] is useful here: Plot[x^2, {x, 0, 2}, Filling -> Axis, FillingStyle -> Directive[Opacity[0.5], Blue], Frame -> True] Regards, Yves Nasser M. Abbasi schrieb: > Version 7 on windows XP sp2. > > This is really a strange one, it seems like a "bug", but if not, then what > is it? > > I have a function defined with UnitStep[]. I plot it using Plot and using > Filling->Axis. > > The filling works ok across all the plot range even with different > FillingStyles for the color. > > But when I use Opacity[] to change the filling Style more, then only _part_ > of the plot is now affected by the Opacity[] and the other part is not. > > Compare the following 2 plots to see: > > y = -400*UnitStep[x - 100.8] + 8*(x - 63.4)*UnitStep[x - 63.4] > -8*(x - 43.2)*UnitStep[x - 43.2] + 221.3 > > Plot[y, {x, 0, 144}, > Filling -> Axis, > FillingStyle -> {Opacity[0.5], Blue}, > Frame -> True] > > Plot[y, {x, 0, 144}, > Filling -> Axis, > FillingStyle -> Blue, > Frame -> True] > > --Nasser > >