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Gnuplot erases circles when zoomed in

I am trying to plot a file of data along with 2 circles with gnuplot. The data file is here and the circle file is here. The circles are quite big compared to the dataset, and when I plot it on a large scale everything works fine. But when I try to zoom in, the circles disappear. Here are the gnuplot commands I use (v5.4.2):

plot 'data.txt' us (log($2)):(log($3)) w lp, 'circ.txt' us 1:2:3 w circles

Here is the result (looks ok):

pic1

Now if I try to zoom in a little (still ok):

set xrange [*:55]
replot

pic2

Trying to zoom in more (circles disappear!)

set xrange [*:8]
replot

pic3

Is this a bug in gnuplot, or is there a way to fix this and visualize the circles on a zoomed in view?

Solution

  • Gnuplot does not draw points that are out of range. You can think of a circle as a point defined by its center and radius. As soon as the center goes out of range, in this case xmin < xmax < center, the circle is no longer drawn.