MATLAB: How to equate a character to an integer

MATLAB

I'm trying to write a function to find the summation of an m by n matrix.
if true
  % code
end
m = 3.6
n = 4
if m == true && n == true
for i = 1:m
for j = 1:n
A(i,j) = i + j;
end
end
else 
 disp('both m and n must be positive integers.')
end
end

Best Answer

Try this. I do it both your way, and a more MATLABy way with meshgrid that avoids explicit loops.
m = 3 % Rows or y
n = 4 % Columns or x
if rem(m, 1) == 0 && rem(n, 1) == 0 && m >= 1 & n >= 1
  % Double for loop way:
  A = zeros(m, n);
  for row = 1 : m
    for col = 1 : n
      A(row, col) = row + col;
    end
  end
  
  % Vectorized, MATLAB way:
  [C, R] = meshgrid(1 : n, 1 : m)
  B = C + R  
else
  uiwait(errordlg('Both m and n must be positive integers.'))
end
A % Show in command window.
You get
B =
     2     3     4     5
     3     4     5     6
     4     5     6     7
A =
     2     3     4     5
     3     4     5     6
     4     5     6     7
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