CELLADD is the jCell module of jLab.

 CELLADD  Addition acting on each element in a cell array.
 
    Z=CELLADD(X,Y) where X and Y are both cell arrays of N arrays, with 
    corresponding elements in X and in Y having the same size, returns the
    cell array Z containing their sums, 
 
        Z{1}=X{1}+Y{1}, Z{2}=X{2}+Y{2},..., Z{N}=X{N}+Y{N}.
 
    One of X or Y may also be a scalar or a numeric array of the same 
    length as the other input argument.
 
    Usage: z=celladd(x,y);
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    This is part of JLAB --- type 'help jlab' for more information
    (C) 2008--2019 J.M. Lilly --- type 'help jlab_license' for details