Re: [Gnuplot-info] Plotting partial file based on 3rd column

[Thor A. <ta...@to...>]

On Wed, Jan 16, 2013 at 11:50:20AM +0100, Mikhail Kononets wrote:
> Hi Thor
 
Hi Mikhail, thanks for the help.

> why not using 1/0 specification instead of '?':
> 
> echo "set table; plot 'data' u 1:((strcol(3) eq 'B')? \$2 : 1/0)" | gnuplot
> 
> # Curve 0 of 1, 5 points
> # Curve title: "'data' u 1:((strcol(3) eq 'B')? $2 : 1/0)"
> # x y type
>  0  0  u
>  0  0  u
>  1  1  i
>  2  4  i
>  0  0  u

I see, it does work better with NaNs, returning undefined for
non-matching lines.  The only issue is if I want to connect data points
separated by one of the undefined lines, see for example:

echo "plot 'data' u 1:((strcol(3) eq 'A')? \$2 : 1/0)" | gnuplot

[...]

-- 
best regards
Thor Andreassen