Machine Learning 1 Linear Algebra Review quiz
A=[4639],B=[−2−592]
To subtract B from A, carry out the subtraction element-wise.
[23734313]
⎡⎣⎢⎢⎢⎢⎢⎢23734313⎤⎦⎥⎥⎥⎥⎥⎥
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
u=⎡⎣814⎤⎦
Let u and v be 3-dimensional vectors, where specifically
u=⎡⎣−343⎤⎦
v=⎡⎣315⎤⎦
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.
A∗B∗A=B∗A∗B
If A is the 3x3 identity matrix, then A∗B=B∗A
A∗B=B∗A
A+B=B+A
We add matrices element-wise. So, this must be true.
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