Re: what is the use of "u" in tabulated output?

[<us...@be...>]

Zitat von pl...@pi...:

> On 04/23/14 20:47, Ethan A Merritt wrote:
>
> What is the most consistent with a terminal plot ?  Terminals produce no
> output for NaN points. Producing no output into the table would seem to
> be the best equivalent to me. That is the behaviour I was expecting , at
> least.
>
> There may be a case for outputting NaN in column 1 and the expression in
> col 2 but this could fail , for example , if I was doing the NaN trick
> to prevent evaluation of the expression in a range where it would fail.
>
> f(x)=1/x;
>   plot datafile using   (($1<0)?$1:NaN):(2 * f($1))
>
> so perhaps NaN NaN  ??
>
> I think no output is the most consistent with no point in a plot unless
>   someone can see something I've missed.

I do also agree with you, that no output is more consistent.

Because you're talking about the NaN trick, I would like to raise a  
related discussion: I've been thinking about a new option which allows  
to treat NaN or 1/0 as missing instead of invalid data points. That  
would improve the possibilities to filter data in gnuplot and still  
being able to plot them with lines. I think that won't be much work,  
but how could such an option be called?

Christoph