Converting arrayfun to loop

So in this code,

 function cipher_text = vigenere_cipher(origionalText,key)
    Array = Operator;

    key = lower(key) - double('a') + 1;     %Converts all text to lowercase
    key(key < 0) = 27;
    origionalText = lower(origionalText) - double('a') + 1;
    origionalText(origionalText < 0) = 27;

    keyLength = rem(0:(numel(origionalText)-1), numel(key))+1;       %Converst the key to the length of the origional text
    k = key(keyLength);

    % Encrypt: C(n) = V(k(n), plaintext(n))
    cipher_text = arrayfun(@(m,n) Array(m,n), k, origionalText) - 1;
    cipher_text(cipher_text == 26) = double(' ') - double('a');
    cipher_text = upper(char(cipher_text + double('a')));
 end

i want to change:

 cipher_text = arrayfun(@(m,n) Array(m,n), k, origionalText) - 1;
    cipher_text(cipher_text == 26) = double(' ') - double('a');
    cipher_text = upper(char(cipher_text + double('a')));

to a for loop. How would i do that?

[Walter Roberson]

How does this differ from http://www.mathworks.com/matlabcentral/answers/302182-how-to-convert-arrayfun-to-for-loop#comment_389765 in which you said that you got the code working, in response to someone else who asked about converting the same code to a for loop?

Answer 1

[Walter Roberson]

A = arrayfun( @(p,q) B(m,n), C, D);

can be converted to

A = zeros(size(C));
for idx = 1 : numel(C)
  A(idx) = B( C(idx), D(idx) );
end

Except that this code does not correctly account for the possibility that a data type other than double is being returned.