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Question on defaults in positional arguments


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


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