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

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EL
EL 2017-4-8
评论： EL 2017-4-8
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.

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the cyclist
the cyclist 2017-4-8
I would draw that line like this:
line([xValue xValue],[1 400])
  1 个评论
EL
EL 2017-4-8
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?

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