How to call the element in a unknown 2-dim matrix???^_^

This is my first time to use the Matlab. I want to do operations on each element(the index doesn't really matter). However I don't know how to call them if I don't now the size. I should use for or while, and how? （≧∇≦） Btw, I also want to ensure , will the function return 6666 if I tap "disp(6666)"? Thanks a lot~ :)

[James Tursa]

Please be more specific. Maybe give a short example showing the inputs and your desired output.

Answer 1

[Stalin Samuel]

    a = randi(2,2);%%your matrix
  [r c] = size(a);%%returs no of rows and columns in the matrix a

    disp('-------the matrix elements are----')
    %%print the elements 
    for i = 1:r
        for j = 1:c
            disp(sprintf('%d\n',a(i,j)))
        end
    end

    %%multiply 'a' by 3 
    a= 3*a

[Manqiao Wang]

Thx a lot

Answer 2

[Walter Roberson]

x = 1 : 50;

for K = 1 : length(x)
  y(K) = x(K).^3 - 10*x(K).^2 - 5;
end

y2 = x.^3 - 10*x.^2 - 5;   %same result as y to within roundoff error