Re: arguments/realtime3d

*To*: mathgroup at smc.vnet.net*Subject*: [mg32286] Re: [mg32246] arguments/realtime3d*From*: "P.J. Hinton" <paulh at wolfram.com>*Date*: Fri, 11 Jan 2002 04:35:20 -0500 (EST)*Organization*: "Wolfram Research, Inc."*Sender*: owner-wri-mathgroup at wolfram.com

On Wed, 9 Jan 2002, daniel wrote: > Is there a way to obtain the number of arguments with wich > the function was called as in > f[x___?OptionQ]:=Module ...? In principle, it should be possible to invoke Length[] on a list wrapped around the argument sequence. In[1]:= g[x___?OptionQ] := Print["Number of arguments: ", Length[{x}]] In[2]:= g[a -> b, c -> d, e -> f] Number of arguments: 3 Why would one create a function with only optional arguments in the first place? Do you intend a Null argument to be valid input as well? > I would like to check if x contains only valid options of f (defined with > Options[f,a->1]) See the function FilterOptions[], which is defined in the Standard Package Utilities`FilterOptions`. For more information, paste the following expression in a notebook and evaluate it. FrontEndExecute[ FrontEnd`HelpBrowserLookup["AddOns", "Utilities`FilterOptions`"] ] > second question: is there a way to have RealTime3D under Linux (Matematica > 4.0) No, RealTime3D wasn't introduced on X Window front ends until the release of Mathematica 4.1. -- P.J. Hinton User Interface Programmer paulh at wolfram.com Wolfram Research, Inc. Disclaimer: Opinions expressed herein are those of the author alone.