Plot not robust with respect to Inf values

[John W. Eaton]

On  6-Aug-2008, gOS wrote:

| 
| Attempting to pass Inf or NaN to plot results in interestingly different
| results, and there's a bug somewhere in it.
| 
| plot(NaN,NaN) results in
| error: plot: expecting first argument to be asex handle ... etc
| 
| plot(Inf,Inf) results in
| line 15: undefined variable: Inf
| 
| gnuplot> plot "-" using ($1):($2) axes x1y1 title "" with lines ...
| 
| I'd assume that there is some sort of failure on all graphics packages. As
| Inf and NaN can appear in matrices, shouldn't plot be able to identify when
| its passed data it shouldn't be passed?
| 
| I view this as a bug. Matlab simply returns a blank plot while not crashing,
| if this isn't possible in Octave for each back end it probably needs to be
| handled.
| 
| Even getting an error from Octave instead of gnuplot would be good enough
| for me, currently operations procede if Inf is present so there is no way to
| catch on the issue besides checking every value in the matrix before
| plotting.

Please try the following change.

jwe

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