gnuplot plot nth point for 2D vector plot

Question

For 1D plots, I know I can plot every nth point using:

plot "data" every 8 using 1:2

However I want to do the same for a 2D vector plot. Currently I am doing (e.g.):

plot "temp" every 8 using 1:2:5:6 with vector nohead

though this just plots every nth point in the y-direction, not for x and y. If not, is there a quick awk oneliner to fix the input file?

every 2 points every 4 points every 8 points

It could be as simple as using every 8:Y (Y being the block increment) if your data file is organized into blocks. Otherwise it might require reformatting your data file--I should point out that we can't really give you a quick awk one-liner without seeing how your data file is formatted. — andyras
– andyras, Commented Mar 4, 2014 at 19:02

Christoph · Accepted Answer · 2014-03-04 19:06:29Z

2

I guess your data is formatted in blocks, i.e. different x-values are separated by an empty line:

x0 y0
x0 y1
x0 y2 
...
x0 yn

x1 y0
x1 y2
...

In that case, using every 8 only selects every eighth point in every block (those unit separated by empty lines). So you must also select every eighth block with every 8:8:

plot "temp" every 8:8 using 1:2:5:6 with vector nohead

That behavior doesn't depend on the plotting style, but only on the data file format.

answered Mar 4, 2014 at 19:06

Christoph

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1 Comment

Hemmer Over a year ago

Perfect, exactly what I need. I had previously tried every 2,2 but that didn't work.

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