should gnuplot handle NaN in input data?

[<pl...@pi...>]

Hi,

it appears that gnuplot can handle most things it cannot parse in input 
data as unplottable data. All that is  _except_ IEEE NaN.

Of course any specific value can be defined by 'set datafile missing' 
but there is no default for this.

This situation has the paradoxical effect mentioned above that if I have 
a data line that reads " ugh 0.0 " , it will be skipped as unreadable 
but if I have " NaN 0.0 " it will cause the plot to fail with 
"unreadable" data.

It seems it is precisely because gnuplot IS able to parse NaN that it is 
causing an error. If it could not understand it , it would ignore the line.

Since gnuplot would effectively regard this as a NaN if it could not 
parse it , it seems a bit illogical that having parsed "NaN" as meaning 
NaN it refuses to act on it being NaN and triggers an error.

Is there some problem with this value, when it is parsed in input, being 
used for what it is unless another "missing" value has been explicitly 
defined with 'set datafile missing' ?


Thanks.