a function generating a square matrix

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!

Answer 1

[Jan]

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.

Answer 2

[Jorg Woehl]

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.

[Thomas Kozinski]

Thank you for your answer,

however, I have to write a function to do this.

[Jorg Woehl]

I am not sure I understand what you are trying to do...

[Thomas Kozinski]

I need to create a function that generates a square matrix A of given size (using loops and conditional statements).

[Jorg Woehl]

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".