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MathGroup Archive 1995

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Re: Plotting

  • To: mathgroup at smc.vnet.net
  • Subject: [mg2173] Re: Plotting
  • From: browe at netcom.com (Bill Rowe)
  • Date: Thu, 12 Oct 1995 01:58:03 -0400
  • Organization: Hughes Aircraft Company

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}]

How about either

   Plot[Re[(-1)^x], {x, -5, 5}]

or

   Plot[Im[(-1)^x], {x, -5, 5]

I realize neither of these is the same as the function you asked about.
However, the problem isn't with Mathematica. After all it wasn't
Mathematica that decided Sqrt[-1] is complex.

-- 
"Against supidity, the Gods themselves contend in vain"


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