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Mary Joyce Habana on 24 Oct 2021
Commented: John D'Errico on 26 Oct 2021

Sargondjani on 24 Oct 2021
[0 0 0;1 2 3] is an example of a matrix i Matlab. Please try the rest yourself. We are not here to do your homework. If you gave it a try, and fail, then come with specific questions what you dont understand.

Image Analyst on 24 Oct 2021
Use sqrt() for square root, pi for pi, commas between columns, and semicolons between rows. For example
m = [0, 1, pi;
sqrt(2), 2, 0]
m =
0 1 3.1416
1.4142 2 0

yanqi liu on 26 Oct 2021
clc; clear all;
A = [ones(2, 3) zeros(2,2)
eye(3) ones(3,1) zeros(3,1)]
A = 5×5
1 1 1 0 0 1 1 1 0 0 1 0 0 1 0 0 1 0 1 0 0 0 1 1 0
B = [pi*ones(1,5)
ones(1,5)
zeros(1,5)
ones(1,5)]
B = 4×5
3.1416 3.1416 3.1416 3.1416 3.1416 1.0000 1.0000 1.0000 1.0000 1.0000 0 0 0 0 0 1.0000 1.0000 1.0000 1.0000 1.0000
C = sqrt(2)*ones(3,3)
C = 3×3
1.4142 1.4142 1.4142 1.4142 1.4142 1.4142 1.4142 1.4142 1.4142
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John D'Errico on 26 Oct 2021
Please don't do homework assignments for people. That does not help them, except to learn there is sometimes someone out there who is foolish enough and willing to do their work for them.