Re: Question on defaults in positional arguments

*To*: mathgroup at smc.vnet.net*Subject*: [mg112629] Re: Question on defaults in positional arguments*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Thu, 23 Sep 2010 04:23:57 -0400 (EDT)

Handle with two definitions Clear[f] f[y_: 2] := f[1, y, 3] f[x_, y_, z_: 3] := {x, y, z} {f[], f[y], f[x, y], f[x, y, z]} {{1, 2, 3}, {1, y, 3}, {x, y, 3}, {x, y, z}} Bob Hanlon ---- NP <nomplume69 at gmail.com> wrote: ============= 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