Change x axis scale in Gnuplot

Question

I'm trying to change the scale of the x-axis linearly, that is, that the distance between the points was proportional, so I have two points (12.23 and 12.12) that should be glued together and others like 19.35 with 23, 8 that should be well spaced and 23.8 to 24.7 that should be closer, but I was not able to do this correctly.

   reset
set encoding iso_8859_1
set key fixed right top vertical Right noreverse noenhanced autotitle nobox
set style increment default
set datafile missing '-'
set style data linespoints
set xtics border in scale 1,0.5 nomirror rotate by -45 # autojustify
set xtics  norangelimit 
set xtics ()
set log x
set key center top inside
set title "DC 5,86%" 
set xrange [ * : * ] noreverse writeback
set x2range [ * : * ] noreverse writeback
set yrange [ * : * ] noreverse writeback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback

plot 'teste2.dat' using 2:xtic(1) title columnheader(2),'teste2.dat' using 3:xtic(1) title columnheader(3) 

my test2.dat is:

    DC      L=1    L>1
42.85   15.98   -
32.5        -   26.09
30.76   23.12   -
24.7        -   31.75
23.8    33.1    -
19.35   42.11   -
14.03   61.72   -
12.23   62.65   -
12.12       -   75.38
10.98   44.58   -

I've been trying to do this for some time. Could someone help me with this function?

Answer 1

Are you sure you provided the actual code to produce this graph? The title is different.

Anyway, if you look at your code there is the line set log x, so your x-axis is scaled logarithmically. Detlete this line and the scaling should be linear.

Futhermore, actually, you are coding: using 2:xtic(1), this will set the first column as text label. And the distances between each labels will be 1, not the real x distance. If you want to have the real x value on the x axis you have to code: using 1:2.

A further problem could be that your input data has decimal point where in the output graph I see comma. It could be (not sure) that gnuplot will just take integer values from the input data.

Try the following:

Code:

### simple plot
reset session

$Data <<EOD
    DC      L=1    L>1
42.85   15.98   -
32.5        -   26.09
30.76   23.12   -
24.7        -   31.75
23.8    33.1    -
19.35   42.11   -
14.03   61.72   -
12.23   62.65   -
12.12       -   75.38
10.98   44.58   -
EOD

plot $Data u 1:2 w lp pt 7 title columnheader(2), \
        '' u 1:3 w lp pt 7 title columnheader(3)
### end of code

Result: