# a function generating a square matrix

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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!

##### 0 Comments

### 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.

##### 0 Comments

### 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.

##### 4 Comments

Jorg Woehl
on 12 Mar 2021

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