# Find an orthogonal vector

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Samuel Hoppen 2021 年 2 月 16 日
コメント済み: Samuel Hoppen 2021 年 2 月 16 日
I have the following matrix: M = [3 18 0;-3 -2 5;-1 5 0;3 3 -9]
I need to find a vector that's orthogonal to all of the vectors in this matrix. I'm familiar with how to solve for a vector that's orthogonal to two vectors (solving for lambda and multiplying lambda by a vector), but not sure how to solve for multiple vectors. Any help is appreciated!

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### 採用された回答

John D'Errico 2021 年 2 月 16 日
Never call a variable O. Consider how difficult it will be to find the bug one day, when you see or write a zero, instead of O. And consider that in some fonts, the difference between them is very slight.
As to the question, use null.
help null
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Samuel Hoppen 2021 年 2 月 16 日
Null(M) gave me a 3×0 empty double matrix. If I then calculate the dot product of null(M) and M, I get an error because the size of the vectors is different.

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