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Not all points plot on my graph...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg105158] Not all points plot on my graph...
  • From: davef <davidfrick2003 at yahoo.com>
  • Date: Mon, 23 Nov 2009 06:49:43 -0500 (EST)

Why is it when I write this...

Clear[f, x]
f[x_] = (x + 2)^(2/3)
Plot[f[x], {x, -3, 0}, PlotRange -> {{-3, 0}, {-4, 4}}]
f[-3]

.. I get no values show in the graph for x<-2 even though f[-3]
evaluates to (-1)^(2/3).

(-1)^(2/3) evaluates as f[-3]=1 so why wouldn't the point (-3,1) plot
on my graph?



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