Machine Learning 1 Linear Algebra Review quiz
To subtract B from A, carry out the subtraction element-wise.
To multiply the vector x by 3, take each element of x and multiply that element by 3.
Let u be a 3-dimensional vector, where specifically
Let u and v be 3-dimensional vectors, where specifically
1x3 dimensional matrix, and v can also be seen as a 3x1
matrix. The answer you want can be obtained by taking
the matrix product of uT and v.) Do not add brackets to your answer.
Let A and B be 3x3 (square) matrices. Which of the following
must necessarily hold true? Check all that apply.
If A is the 3x3 identity matrix, then A∗B=B∗A
Even though matrix multiplication is not commutative in general (A∗B≠B∗A for general matrices A,B), for the special case where A=I, we have A∗B=I∗B=B, and also B∗A=B∗I=B. So, A∗B=B∗A.
We add matrices element-wise. So, this must be true.
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