Displaying markers on specific values in Gnuplot's line plot
cdf, gnuplot, linestyle
Solution
There is no need to use two plots commands, just use the `pointinterval` option:
plot 'data' pointinterval 5 with linespoints
That plots every line segment, but only every fifth point symbol.
The big advantage is, that you can control the behaviour with `set style line`:
set style line 1 lc rgb 'blue' lt 1 lw 2 pt 7 ps 0.75 pi 5
plot 'data' w lp ls 1
Problem
I have data for a CDF in a file which looks like the following: ``` 0.033 0.0010718113612 0.034 0.0016077170418 0.038 0.0021436227224 ... ... ... ... 0.847 0.999464094319 0.862 1.0 ``` First column is the X-axis value and the second column is the CDF value on Y-axis. I set the line style as follows: ``` set style line 1 lc rgb 'blue' lt 1 lw 2 pt 7 ps 0.75 # --- blue ``` and subsequently plot the line with the following: ``` plot file1 using 1:2 title 'Test Line CDF' with linespoints ls 1 ``` This all works fine, the problem seems to be that my CDF file is pretty big (about 250 rows) and Gnuplot would plot the marker/point (a circle in this case) for every data point. This results in a very "dense" line because of the over-concentration of markers such that the underlying line is almost not visible as I show in an example image below: How can I selectively draw the markers so that instead of having them on all data points, I plot them after every 50 data points, without having to decrease the number of data points (which I believe is what `"every n"` in the plot command would do) in my data file or decrease the marker size?