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2015-03-07 22:43:41 +0200 | asked a question | How do I create and plot a vector from the difference between two points? Having points $a$ and $b$, how do I create a vector that goes from $a$ to $b$? I'm trying the following but I get an error: Then, how do I plot $a$, $b$ and $u$ at the position of $a$? The error is
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