gnuplot-info

[Gnuplot-info] graph "disappears" with column() in using spec

[Daniel G. <li...@da...>]

Hello,

plotting
plot 	"Pen10-M-$0.out" using 1:2 "LCE,%lf,77,500,%lf,%lf" title "0" with lines
works fine.

Plotting
plot 	"Pen10-M-$0.out" using 1:(column(2)) "LCE,%lf,77,500,%lf,%lf" title "0" with lines

should produce the same result but the curve does not show up. Autoscale works but no plot appears. So it is not possible for me to plot:
plot 	"Pen10-M-$0.out" using 1:(column(2)+column(3)) "LCE,%lf,77,500,%lf,%lf" title "0" with lines
but it should.

Did I miss something?

Regards,
Daniel.

P.S. using gplot 4.1

Re: [Gnuplot-info] graph "disappears" with column() in using spec

[<br...@ph...>]

Daniel Graupner wrote:
> Hello,
> 
> plotting
> plot 	"Pen10-M-$0.out" using 1:2 "LCE,%lf,77,500,%lf,%lf" title "0" with lines
> works fine.
> 
> Plotting
> plot 	"Pen10-M-$0.out" using 1:(column(2)) "LCE,%lf,77,500,%lf,%lf" title "0" with lines

Here's a guess: if you plot 'with points' instead, you'll get a plot.

To see what actually happened, plot this to the table terminal and 
observe the breaks in the sequence of points.  The problem is that two 
data points matching the format string never follow each other directly, 
in your data file.

In a nutshell: I don't think the scanf format string feature is a good 
idea to use for filtering your data.  'grep' exists --- use it.