Finding 2D Perpendicular Vector

Sage
Posts: 1,066
Joined: 2004.07
Post: #1
How can I find a vector perpendicular to a vector I have in two dimensions? I know that the cross product does such thing given two vectors in three dimensions, but how can I find one simply perpendicular to another one in two dimensions?
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Luminary
Posts: 5,143
Joined: 2002.04
Post: #2
(-y, x) or (y, -x)
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Sage
Posts: 1,066
Joined: 2004.07
Post: #3
I suppose I should've been more specific. If I have an arbitrary two dimensional vector, is there a way to find the vector perpendicular to it?
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Luminary
Posts: 5,143
Joined: 2002.04
Post: #4
(-y, x) or (y, -x)
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Sage
Posts: 1,066
Joined: 2004.07
Post: #5
My mistake. I didn't fully realize you switched the y and x into the other's position. I guess I'm a little tired. Thanks.
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