Since ‘X’ is a cell array, you first must convert it to a double array, here using ‘[X{:}]’:
X = { 1, 2, 3, 5, 6};
M = log10([X{:}])
producing:
M =
0 0.3010 0.4771 0.6990 0.7782
Please do not name them ‘M1’...‘M4’. Keep them as a single array, and refer to them that way. If you want them to be individual elements of a cell array, use the num2cell function.
