Re: How to express this function.
- To: mathgroup at smc.vnet.net
- Subject: [mg84240] Re: How to express this function.
- From: mark <markmgg at googlemail.com>
- Date: Fri, 14 Dec 2007 23:18:26 -0500 (EST)
- References: <fjunch$27q$1@smc.vnet.net>
On Dec 15, 12:00 am, "huxiaopengs... at gmail.com" <huxiaopengs... 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? The function "Which" will do that for you. The problem is when f equals x, the condition wasn't clear (I mean 0<x1/2) but I will use the following example to illustrate the method, and then you will have do some changes to suite your problem: In[1]:= f[x_] := Which[-1/2 < x < 0, -x, 0 < x < 1/2, x] In[2]:= f[1/4] Out[2]= 1/4 In[3]:= f[-1/3] Out[3]= 1/3