Re: Questions on Plotting A Graph

*To*: mathgroup at smc.vnet.net*Subject*: [mg20363] Re: [mg20326] Questions on Plotting A Graph*From*: BobHanlon at aol.com*Date*: Sun, 17 Oct 1999 02:45:38 -0400*Sender*: owner-wri-mathgroup at wolfram.com

Martin, Plot[Sqrt[x - 1], {x, 1, 5}, PlotRange -> {{0, 5}, Automatic}, PlotStyle -> RGBColor[1, 0, 0]]; Plot[Floor[x] - Abs[x], {x, -2.5, 2.5}, PlotRange -> {Automatic, {-5.5, 1}}, PlotStyle -> RGBColor[1, 0, 0]]; Note that y is only restricted to the Interval[{-1, 0}] if x is nonnegative. Bob Hanlon In a message dated 10/16/1999 1:48:02 AM, martingomez at philosophers.net writes: >One. How do I plot a graph of a function involving square roots such that >the resulting graph would only yield a graph true to the set of real numbers >and not consider complex and imaginary numbers? Take this case for example... >for f(x) = Sqrt[x-1]. Given that x should be greater than or equal to 1, >such that the result would be a real number. (ie. The resulting graph would >only be the upper bisection of a parabola opening to the right given that >V(1,0) showing only the part at the first quadrant on the Cartesian plane) > >Two. How do I plot the graph of a greatest integer function (e.g. floor)? >Given for example, that y = [[x]] - |x| (please note that I used a double >bracket to indicate floor) and solving for the domain and range would yield, >all elements of the set of real numbers and {-1 less than y less than or >equal to 0} union something, respectively? >