Re: How to express this function.

*To*: mathgroup at smc.vnet.net*Subject*: [mg84237] Re: How to express this function.*From*: "David W.Cantrell" <DWCantrell at sigmaxi.net>*Date*: Fri, 14 Dec 2007 23:16:53 -0500 (EST)*References*: <fjunch$27q$1@smc.vnet.net>

"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. I must suppose that you meant -x when -1/2<x<0. > How to express this function? There are many ways to do that in Mathematica. One way, using the Floor function, is f[x_]:= (-1)^Floor[2 x] ((2 x - Floor[2 x])/2 - 1/4) + 1/4 David

**Follow-Ups**:**Re: Re: How to express this function.***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>