Fix the function hlp

i was told to write funciton for this: but it keeps saying something is wrong but i dont know what is wrong with it .

function [ arr ] =special_matrix( n )
if n>2
    for i = 1:n
        for j = 1:n
            if mod(j,3)==0
                arr(i,j)}=((i-1)*n+j}^j;
            else
                arr(i,j)={i-1}*n+j;
            end
        end
    end
else
    disp('Error; n must be greater than i')
end
end

[Walter Roberson]

 arr(i,j)}=((i-1)*n+j}^j;

You have two } each not matched by previous {

{} in MATLAB is only used for cell arrays or working with composite objects like tables. It is never used for prioritization. prioritization is only through () brackets

[Sam Chak]

The original question may be beneficial for people who wish to learn how to create special square matrices.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Jan]

By the way, this can be done in one line:

arr = reshape(1:n^2, n, n).' .^ ((1:n) .^ rem(0:n-1, 2))

Have fun with analyzing, how this works.

Is there a shorter solution?