How to change sign in a cell?

Hi all:

I have a cell 'respPreStore' like this:

size(respPreStore)
ans =
     1     2     5     2

each cell element is

respPreStore(:,:,1,1) = 
    [12x4 double]    [12x4 double]

Now I simply want to change sign of each value in respPreStore, however if I do:

-respPreStore
Undefined function 'uminus' for input arguments of type 'cell'.

How can I change sign of each value in respPreStore?

Many thanks!

Answer 1

[James Tursa]

respPreStore = cellfun(@uminus,respPreStore,'uni',false);

[Xh Du]

Thank you!