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Re: Re: How to express this function.
Here is another definition, which has the (probably insignificant) advantage of extending naturally to complex arguments: f[x_] := Abs[Arg[Exp[2 Pi I x]]]/(2 Pi) Andrzej Kozlowski On Fri, 14 Dec 2007 13:58:44 -0600, huxiaopengstat at gmail.com <huxiaopengstat at gmail.com> wrote: > f is a period continual function with period 1. > f equals x when 0<x1/2,equals -x when -1/2<x<1. > > How to express this function? > >