When I plot a vertical line the line is a series of dots

I want to plot a vertical line on a graph. I have tried both with the classic plot function and with the line function.

line(xValue,y)

where xValue is a single number on the x axis and y is a vector defined as y = 1:0.5:400. What I get is in the image.

I have also tried defining the style of the line which for a solid line should be '-' even though it should be solid by default, but nothing changed.

Answer 1

[the cyclist]

I would draw that line like this:

line([xValue xValue],[1 400])

[EL]

It worked, thank you very much.

Can I ask,I believe the command gives a beginning and an end to the line in a more explicit way, but why such a difference? I mean, what was happening in the previous command that matlab didn't get?