How to create a matrix from other matrixes

So my teacher made this exercise on class earlier this week where you have to build a matrix only using other matrix and vector. I dont really understand it and since i have online clases im having a lot of trouble trying to get an answer from the teacher. Here is the code:

rng(1);
A=randi(10,[4 6]);
v=randi(10,[1 8]);


M = [[v(1,1:4); [A(1:3,1:3) A(1:3,4)]; A(:,4)'] [2;v(1,5:8)']]

I have this as answer:

M =

9 9 1 1 2

5 2 4 3 2

8 1 6 9 9

1 2 5 1 1

3 9 1 7 5

I understand that you use only certain parts of each of M and v(for example v(1, 1:4)). What i dont understand is the order you have to follow to create the matrix M because as its written I understand it as: First line of M is part of the vector v, then second line is part of (what does that mean?) of A, and then last line is a part of A again. And then, in the next bit of code you define a new column??

Thanks in advance

Answer 1

[madhan ravi]

I undertand your pain of online classes brother. Have a read:

https://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

Take part in MATLAB On-ramp as well , will make things easier for you.