I would like to know how to give a label at the end of a vector in gnuplot. I know it is possible to use "set" in gnuplot to show a certain label at some place, but I have hundreds of vectors to draw, and I want to show the index of each vector at its end, e.g., "Node n". Thus I wonder if it is possible to show the labels with incremental index in "one step" with corresponding vectors.
My OS is Ubuntu 13.04 32bit version. Thanks for any advice!
Imagine you have a file with the following data (which I named "temp"), where the first two coordinates are the origin and the last two coordinates are the x and y components (projections) of your vector:
0 0 1 1
0 0 1 2
0 0 1 3
0 0 1 4
0 0 1 5
Then you can do what you want with the following commands:
set xrange [0:1.2]
set yrange [0:6]
plot "temp" with vectors, "temp" u 3:4:0 with labels left
The first instance in plot is to plot the vectors with the same convention I mentioned above in the data file, the second instance is to place a label with coordinates x = column 3 and y = column 4 (that is, at the end of your vectors), with text = column 0 (which gives the order of your data entries) and flush it to the left from those coordinates. It looks like this:
with vectorsplotting style for the vectors, and thewith labelsstyle for the according labels (the zeroth column gives you the row number/vector number). For more details, please show a few lines of your data file - Christoph