How to specify the start of the x-axis at 1 instead of 0

Question

I use gnuplot to plot execution times measured on the CPU and GPU depending on the data size. So I have two files with the execution times in it. Plotting them is straight forward.

set title "CPU vs GPU"

set xlabel "Number of Particles (* 10'000)"
set ylabel "Time in Microseconds"

plot "cpuTimes.txt" title "CPU" with linespoints, \
     "gpuTimes.txt" title "GPU" wit

The resulting plot can be found here: 1

I tried to use xtics however it doesn't shift the x-axis to start at 1 but just starts the ticks at 1. How can I shift the x-axis so it starts at 1 and ends at 50?

Update

Datafile cpuTimes.txt below

Some would say choosing your axes to hide data is misleading... — Tom
@Tom I think Nils has just a single column of data. Then gnuplot stars plotting at 0 by default. This is however arbitrary. On the other hand I might just not understand the question correctly^^. — Woltan

Woltan Woltan · Accepted Answer · 2011-07-13T13:57:47

xtics are only to "label" the x-axis. What you are looking for is some sort of "data manipulation". I'd suggest making use of using like so:

plot "cpuTimes.txt" u ($0+1):1 t "CPU" w lp, \
     "gpuTimes.txt" u ($0+1):1 t "GPU" w lp

To make the plot end at 50 there are two ways:

You could specify the x-range with set xrange [1:50] or with

plot [1:50] "cpuTimes.txt" u ($0+1):1 t "CPU" w lp, \
            "gpuTimes.txt" u ($0+1):1 t "GPU" w lp

You need to include every like so:

plot "cpuTimes.txt" u ($0+1):1 every 1::::50 t "CPU" w lp, \
     "gpuTimes.txt" u ($0+1):1 every 1::::50 t "GPU" w lp

See every for documentation for further reference.

How to specify the start of the x-axis at 1 instead of 0

3 Answers