MATLAB: Unable to use mod function on cell array

Question

Say I have cell array A with size 10×10.

I want to perform a modulo on the 6th column of A, which is all numbers.

I have tried the following:

A(:, 6) = arrayfun(@(x) mod(x, 80), A(:, 3));

But then I get the error:

Undefined function 'mod' for input arguments of type 'cell'.

I then tried the following:

A(:,6) = mod(A(:,6), 80);

But I still get the same error. How do I do this?

I have also tried using cellfun:

A(:, 6) = cellfun(@(x) mod(x, 80), A(:, 3));

But then I get the following error:

Conversion to cell from int64 is not possible.

Answer 1

you try to convert a int/double to a cell

% Create random Variable A  
  A=num2cell(rand(10,10));
% check if your cellfun is working
  tmp = cellfun(@(x) mod(x, 80), A(:, 3));
% it is! no errors, great
% now lets assign that thing to your cell
% do a quick check about the types
  class(tmp)
  class(A(:,6))
% Uh oh, double and cell - that assignment wont work. We need to convert
% try
  A(:,6) = num2cell(tmp);
% that works

And now that we know that it works, we try to do it nicely

A(:, 6) = num2cell(cellfun(@(x) mod(x, 80), A(:, 3)));