Re: what is wrong with this code?

*To*: mathgroup at smc.vnet.net*Subject*: [mg130335] Re: what is wrong with this code?*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Wed, 3 Apr 2013 04:11:42 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

On 4/2/13 at 3:24 AM, dougwangsaif at gmail.com wrote: >f[x_] := If[EvenQ[IntegerPart[x]], 0.4, 0.8]; Plot[f[x], {x, 1, >101}] Nothing. But if you are expecting the plot to be a square wave you will need to change the defaults that determine how plot samples the function f. Read the documentation for Plot. Pay particular attention to options PlotPoints and MaxRecursion.