Re: Strange behavior: random and plot

*To*: mathgroup at smc.vnet.net*Subject*: [mg102750] Re: Strange behavior: random and plot*From*: Steven Siew <stevensiew2 at gmail.com>*Date*: Wed, 26 Aug 2009 07:42:28 -0400 (EDT)*References*: <h6o75c$fv2$1@smc.vnet.net>

The problem goes away if you write this ran[x_] := Random[Real, x] qqq[x_] := ran[x] - ran[x] Plot[qqq[x], {x, 0, 3}] On Aug 22, 5:36 pm, Don Krug <kr... at nku.edu> wrote: > Hi group. I am new here and discovered some strange behavior (to me.) > Hope someone can help. > > I will be teaching a course on programming with Mathematica this > semester and so you may hear from me some more. > > I define > > ran[x_]:=Random[Real,x] > > If I evaluate ran[3]-ran[3] I get a non-zero result as expected. > > But if I do > > Plot[ ran[x]-ran[x] ,{x,0,3}] > > I get an empty axes system. I assume it is the plot of the zero fu= nction. >