3 ms·
My advice: - Learn how to multiply a matrix M by a column vector v. - Generalise that by noticing that M[u|v|...] = [Mu|Mv|...]. That's matrix multiplication
by ogogmad 5y ago
My advice:
- Learn how to multiply a matrix M by a column vector v.
- Generalise that by noticing that M[u|v|...] = [Mu|Mv|...].
That's matrix multiplication.
- qsort 5y agoAfter all it's called linear algebra for a reason :)
- madars 5y agoYep! Wikipedia has a very useful visual https://en.wikipedia.org/wiki/Matrix_multiplication#/media/File:Matrix_multiplication_diagram_2.svg https://en.wikipedia.org/wiki/Matrix_multiplication#/media/F...
- hwers 5y agoThis is my favorite way to think about it as well. I think I learned it first in one of Steven Boyds astounding convex optimization lectures https://www.youtube.com/watch?v=McLq1hEq3UY https://www.youtube.com/watch?v=McLq1hEq3UY
- fault1 5y agoalso related: the left multiplication of a matrix M by a row vector: https://dzone.com/articles/visualizing-matrix https://dzone.com/articles/visualizing-matrix