The Matrix Variable Problem

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Ting Chie Yu
Ting Chie Yu 2021-3-13
评论： Ting Chie Yu 2021-3-13
What does this question mean? What is the command code in this matrix?
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Jan
Jan 2021-3-13
No, the diagram is not a 3x3 matrix. The dots mean, that there is a not specified number of elements not show. The text explains, that this is a 3x4 matrix: 3 rows, 4 columns. "Full of 5's" means, that all elements are 5's.

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Jan
Jan 2021-3-13
You must use ones or zeros sounds, like you should use one of these commands. Then read their help text:
help ones
help zeros
% Or more exhaustively
doc ones
doc zeros
Now you have learned, how to determine the size of the output of these commands. You will need:
bMat = ones(3, 4)
% or
bMat = zeros(3, 4)
In the first case the elements are ones, in the second case zeros. So how can you change them to 5? There are a lot of ways:
% Here it does not matter if ONES or ZEROS has been used:
bMat(:) = 5
bMat(:, :) = 5
% or
bMat = ones(3, 4) * 5
% or
bMat = ones(3, 4) + 4
% or
bMat = zeros(3, 4) + 5
% or
bMat = ones(3, 4);
bMat = bMat + bMat + bMat + bMat + bMat;
% or
bMat = [ones, ones, ones, ones; ...
ones, ones, ones, ones; ...
ones, ones, ones, ones]
% or
bMat = [ones(2, 3), ones(2, 1); ones(1, 4)] + 4;
% or:
bMat = ones(1, 4) * 5 .* ones(3, 1)
The forum is not efficient to learn the fundamental basics. I recommend to learn Matlab's Onramp at first.
I know I've solved your homework here. But if you carefully read all suggestions, you will learn something also.

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