If I have a data file with 4 columns:
x1, y1, x2, y2,
How can plot a line connecting (x1, y1)
to (x2, y2)
for each element (row)?
I assume it is pretty easy, but I have been playing around for an hour unsuccessfully.
If I have a data file with 4 columns:
How can plot a line connecting I assume it is pretty easy, but I have been playing around for an hour unsuccessfully. 


The vectors style reads four columns (x, y, dx, dy) and draws a vector from (x, y) to (x + dx, y + dy).


