MathGroup Archive 1999

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Questions on Plotting A Graph

  • To: mathgroup at
  • Subject: [mg20326] Questions on Plotting A Graph
  • From: "Martin Gomez" <martingomez at>
  • Date: Fri, 15 Oct 1999 20:20:50 -0400
  • Sender: owner-wri-mathgroup at


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?



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