MATLAB: How to find NaN values in a cell array.

??? undefined function or method 'isnan' for input arguments of type 'cell'.

This is my data:
a = {'raja'  'I'   76   56  NaN;'bala'  'R'   12   7   56;'kavi'  NaN   56   5   12}
X = find(isnan(a));
I got
??? undefined function or method 'isnan' 
for input arguments of type 'cell'.

Best Answer

Try this to examine columns 2 onwards:
a = {'raja'  'I'   76   56  NaN;'bala'  'R'   12   7   56;'kavi'  NaN   56   5   12}
b = cell2mat(cellfun(@isnan, a(:, 2:end), 'UniformOutput', false))
You'll see:
a =
  3×5 cell array
    'raja'    'I'      [76]    [56]    [NaN]
    'bala'    'R'      [12]    [ 7]    [ 56]
    'kavi'    [NaN]    [56]    [ 5]    [ 12]
b =
  3×4 logical array
   0   0   0   1
   0   0   0   0
   1   0   0   0
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