# a function generating a square matrix

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Thomas Kozinski on 11 Mar 2021
Answered: Jan on 13 Mar 2021
Hello!
I am trying to create a function who creating a matrix like that
A = [11 12 13 14]
[21 22 23 24]
[31 32 33 34]
[41 42 43 44]
And I have no idea how to do it, can someone could give me any tips?
How should I approach that?
Thank you!
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### Accepted Answer

Jan on 13 Mar 2021
This is not a matrix in Matlab, but invalid syntax:
A = [11 12 13 14]
[21 22 23 24]
[31 32 33 34]
[41 42 43 44]
Do you mean:
A = [11 12 13 14; ...
21 22 23 24; ...
31 32 33 34; ...
41 42 43 44];
Now this is the solution already. You can insert it in a function an in a (useless) loop also:
function A = myFunction
for k = 1:1
A = [11 12 13 14; ...
21 22 23 24; ...
31 32 33 34; ...
41 42 43 44];
end
end
Do you see the problem? he question looks like a homework. With the instructions you have provided, this assignment is meaningless. Most likely you are wanted to create a tiny code to get familiar with Matlab. Then asking for a solution will not help you to learn programming in Matlab.
I guess, there are some more details in the original homework assigment. Maybe you are wanted to use 2 loops:
function A = myFuntion2(n)
A = zeros(n, n);
for i1 = 1:n
for i2 = 1:n
A(i1, i2) = i1 * 10 + i2;
end
end
end
An experienced Matlab programmer would omit the loops:
function A = myFuntion2(n)
v = 1:n;
A = 10 * v.' + v;
end
Do you learn something with reading my suggestions? Most likely you do. But you do not learn to program by your own. See also: FAQ: How to get help for homework questions.
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### More Answers (1)

Jorg Woehl on 11 Mar 2021
Edited: Jorg Woehl on 11 Mar 2021
A = [11, 12, 13, 14; 21, 22, 23, 24; 31, 32, 33, 34; 41, 42, 43, 44]
A comma (optional) starts a new column in a matrix, while a semicolon (required) starts a new row. See Get Started with MATLAB: Matrices and Arrays.
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Thomas Kozinski on 12 Mar 2021
I need to create a function that generates a square matrix A of given size (using loops and conditional statements).
Jorg Woehl on 12 Mar 2021
Is there a particular reason that you need to use an (inefficient) loop instead of a simple assignment operation? If your question is related to a class assignment, please tag it as "homework".

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