Error when applying cell2mat

I have several columns in a cell array A with double values, and I am applying this very simple formula to get separate variables:

y=cell2mat(ANALLSper(:,2)); %for example

And for somecase ist gives me this error:

Error using cell2mat (line 45)
All contents of the input cell array must be of the same data type.

Does someone know how to solve it? Thank you very much.

[José-Luis]

It means that not everything in that array is what you think it is. Try looking at that array in the editor.

Answer 1

[Jan]

Check it manually:

all(cellfun('isclass', ANALLSper(:,2), 'double'))

Answer 2

[Image Analyst]

Maybe you don't even need a cell array. Why deal with that complication if you don't have to and you ultimately want to get a double array anyway. Why not just start off using a double array. A cell array is more flexible but more complicated. If you really want the complication of a cell array, read the FAQ: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F