Re: what is wrong with this code?

*To*: mathgroup at smc.vnet.net*Subject*: [mg130325] Re: what is wrong with this code?*From*: psycho_dad <s.nesseris at gmail.com>*Date*: Wed, 3 Apr 2013 04:08:22 -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*References*: <kje13u$grc$1@smc.vnet.net>

You're just seeing some artifacts. Increasing the plotpoints gives a better looking plot: f[x_] := If[EvenQ[IntegerPart[x]], 0.4, 0.8]; Plot[f[x], {x, 1, 101}, PlotRange -> {0, 1}, PlotPoints -> 69] BTW, next time try to be a bit more descriptive than just "what's wrong with this", OK?