Summing elements of an array

Hi, so for example I have P such that: P =

3×1 cell array

    [1]
    [2]
    [3].

The matrix P can be a n x 1 cell array, where n is any positive integer, and can only hold numbers. Ive tried to sum these numbers using sum(P) but keep getting the error ' Undefined function 'sum' for input arguments of type 'cell'. '. Any ideas on how I could do this? thank-you.

[Stephen Cobeldick]

@Gian Carpinelli: why are you storing numeric data in a cell array? It would be simpler to store it in a numeric array.

Answer 1

[KL]

 sum([P{:}])

But why would you store it in cell array? If they are all numeric, better use a numeric array.

Answer 2

[M]

You can use either

sum(cell2mat(P))

or

sum([P{:}])