Hi,

`If i want to plot a line between two points I use the command
``plot([x1,x2],[y1,y1]). If the points are, for example, x1=1, y1=1 and
``x2=2, y2=2, the line is plotted ok. But if the points are x1=1, y1=2
``and x2=1, y2=1 (vertical line) a warning appears: empty x range [1:1],
``adjusting to [ 0.99:1.01]
`What is the problem. Exists any command to plot a line between two points.
Thanks
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