Browsing category linear algebra

A reader asks… about matrices

A reader asks: I know that a square matrix $\mathbf{M}$ maps point $\mathbf{x}$ to point $\mathbf{y}$. Do I have enough information to work out $\mathbf{M}$? In a word: no, unless you're working in one dimension! In general, to work out a square transformation matrix in $n$ dimensions, you need to

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Matrices and Google

Or, how the biggest company in the world is built on matrices. As with most Flying Colours Maths Blog articles, I don’t claim any kind of historical accuracy. The details are likely to be wrong, but I’m not one to let the truth get in the way of the story;

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