Question on defaults in positional arguments

*To*: mathgroup at smc.vnet.net*Subject*: [mg112580] Question on defaults in positional arguments*From*: NP <nomplume69 at gmail.com>*Date*: Tue, 21 Sep 2010 02:03:56 -0400 (EDT)

Hi, I was wondering if there was a way in selectively specifying some of the arguments of a function (rest remaining default). For instance, consider Clear[f, x, y,z]; f[x_: 1, y_: 2,z_:3] := {x, y} f[5] {5,2,3} Here the default values of y and z are automatically used. How can I call f so that, for example, the default value of x and z are used instead? Thanks, NP