Cross product in Matlab for 2*3 dim vectors

Question

vigneshwaran Loganathan 2018-7-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410197-cross-product-in-matlab-for-2-3-dim-vectors

评论： vigneshwaran Loganathan 2018-7-13

采纳的回答： Diwakar

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Is it possible to cross 2*1 and 2*1 vectors in matlab I have a case,

A =

-20.5120
 92.1404,
B =
    3.5051
   -3.9759

I have to cross(A,B), help me with your suggestions

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Rik 2018-7-13

In general you would extend the vectors with a zero to make them 3-element vectors. If this is valid in your case is something you'll have to figure out.

vigneshwaran Loganathan 2018-7-13

I tried extending to a 3 element vector but it isn't the same what i expect, all the vector values are becoming zero

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Answer 1

Diwakar 2018-7-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/410197-cross-product-in-matlab-for-2-3-dim-vectors#answer_328694

编辑：Diwakar 2018-7-13

As far as I understand your question you have two vectors with, x-component and y-component. Now, in order to use the in-build cross product function, the documentations mentions that you need to have a length of 3.

Link to documentation: https://www.mathworks.com/help/matlab/ref/cross.html

So if it doesn't affect you, then I too would suggest you to follow the same method that Rik has suggested to use the in-built function.

If not, you can try to generate your own code for the use case with the idea being, If A=[a1;a2]; B=[b1;b2]; then cross product will be C=(a1b2-a2b1); along the perpendicular to both the input vectors.

Hope this helps Cheers!