default options, OptionsPattern[], and FilterRules[]

*To*: mathgroup at smc.vnet.net*Subject*: [mg106466] default options, OptionsPattern[], and FilterRules[]*From*: Roman <rschmied at gmail.com>*Date*: Wed, 13 Jan 2010 06:00:18 -0500 (EST)

dear group, I am trying to set up a plotting function which has a different default behavior than the standard one. Here's a simple example: Options[myplot] = {PlotRange -> {-5, 5}}; myplot[F_, opts : OptionsPattern[]] := Plot[F, {x, -1, 1}, Evaluate[FilterRules[{opts}, Options[Plot]]]] What I would like to achieve with this is that when I don't specify the PlotRange option, as in myplot[Sin[x]] then I would get a plot with a default plot range of {-5,5}. Unfortunately this does not work, since the call to FilterRules[] does not access the default rules defined in Options[myplot], but only those options explicitly specified in opts (i.e. none at all in this call example). Since this seems like such a standard use of the Options framework of Mathematica, I would expect there to be pre-defined functionality for what I am trying to achieve. Of course I can manually merge the contents of the opts variable with those of Options[myplot] and eliminate duplicates, but I'd like to avoid such hacks if possible. Do you know a simple solution for this problem? Thanks! Roman.

**Follow-Ups**:**Re: default options, OptionsPattern[], and FilterRules[]***From:*Patrick Scheibe <pscheibe@trm.uni-leipzig.de>