Re: [Gnuplot-info] smooth frequency & table

[Thomas S. <t.s...@fz...>]

carminat <carminat <at> dm.unipi.it> writes:

> 
> 
> I re-post here a question I asked in 
> http://www.manning-sandbox.com/thread.jspa?threadID=49316 another forum .
> 
> The smooth frequency directive is very useful to generate histogram of
> statistical data. Sometimes it is desirable (for instance to deal with the
> file of reduced size) to save these statistics as figures in a file; this
> can be done using the set table option.
> 
> Even if you try this on a very simple file, such as
> 1
> 2
> 2
> you get a strange output
> 
> ################
> #Curve 0 of 1, 3 points
> #x y type
>  1  1  i
>  2  2  i
>  2  1  u
> ################
> 
> notice that there is an extra line, as if there was something undefined.
> 
> This weird behaviour does not occur for the simple dataset
> 1
> 2
> 3
> 

the extra line with undefined data is only a problem
when using the 'table' output for further processing,
e.g. plotting.
but since it is marked as undefined and it is at the
end of a data set, you may omit it.
in gnuplot you may do this by using the ternary operator:

plot 'tablefilename' using (stringcolumn(3) eq "i"?$1:0/0):2