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MathGroup Archive 1995

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Re: Plotting

  • To: mathgroup at smc.vnet.net
  • Subject: [mg2147] Re: Plotting
  • From: rmarimon at leland.stanford.edu (Ricardo Marimon)
  • Date: Wed, 4 Oct 1995 01:58:55 -0400
  • Organization: Stanford University

In article <44qj7k$s22 at ralph.vnet.net>, Julian Charko
<jcharko at microage-ll.awinc.com> wrote:

> In order to plot the function f(x) = a^x, where a<0, over a 
> range of integer values of x, what plotting options would you
> need to use with the Plot command? 
> 
> Specifying a plotting range of real numbers in the usual way,
> as shown below, for example, presents problems because
> Mathematica generates complex numbers for fractional exponents,
> and these obviously cannot be plotted by Plot.
> 
>                  Plot[(-1)^x, {x, -5, 5}]

You would have to use ListPlot.  You can try writting

p = ListPlot[Table[{x, (-i)^x}, {x, -5, 0}], PlotJoined->True]
q = Plot[(-1)^x, {x, 0, 5}]
Show[p, q]

I haven't tried but it should work.

- Ricardo Marimon
  rmarimon at leland.stanford.edu


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