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Mathematica conundrum
*To*: mathgroup at christensen.cybernetics.net
*Subject*: [mg1782] Mathematica conundrum
*From*: Zorro <berriz at husc.harvard.edu>
*Date*: Sun, 30 Jul 1995 21:35:46 -0400
*Organization*: Harvard University, Cambridge, Massachusetts
Hi. When I issue the command
Plot[Exp[-5x],{x, 0, 5}, PlotRange->{0,1}];
Mathematica produces the plot without a hitch. Similarly, when I
issue
Plot[Exp[-x],{x, 0, 5}];
Likewise, the command
Plot[Evaluate[Table[Sin[n x],{n, 5}]],
{x, 0, 1}, PlotRange->{-1, 1}];
produces, as expected, a series of superimposed sine waves. BUT,
Mathematica balks at
Plot[Evaluate[Table[Exp[-nx],{n, 5}]],
{x, 0, 5}, PlotRange->{0, 1}];
spitting out
Plot::plnr:
CompiledFunction[{x}, <<1>>, -C<<11>>-][x]
is not a machine-size real number at x = 0..
Plot::plnr:
CompiledFunction[{x}, <<1>>, -C<<11>>-][x]
is not a machine-size real number at x = 0.208333.
Plot::plnr:
CompiledFunction[{x}, <<1>>, -C<<11>>-][x]
is not a machine-size real number at x = 0.416667.
General::stop:
Further output of Plot::plnr
will be suppressed during this calculation.
... and an empty plot (two axes, no graphs).
Why is this? What could the error messages mean?? After all,
Exp[-nx] is well-behaved everywhere, and reasonably valued in the
requested ranges of x and n. ( I have no problems when I try to
produce the plots individually (for each value of n), nor when I use
Show to combine them in a single plot...)
And the meta-follow up: is there a reference I could have looked up
(besides possibly reading Wolfram's book cover-to-cover) to find the
answer to this question?
Thanks for your help.
Z.
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