CELLFIRST is the jCell module of jLab.

 CELLFIRST  Returns the first (or last) element of each entry in a cell array.
 
    Y=CELLFIRST(X), where X is a cell array of N numeric arrays, returns a
    length N array Y containing the first element of each of the N cells.
 
    An example of an input cell array X and the output Y is as follows:
 
        X{1} = [1 2 3]';    X{2} = [3 4]';     X{3} = [5 6 7 ]';  
        Y = [1 3 5]';
 
    [Y1,Y2,...YN]=CELLFIRST(X1,X2,...XN) with multiple input arguments, all
    of the same size, also works.  
 
    CELLFIRST(X1,X2,...XN); with no output arguments overwrites the 
    original input variables.   
 
    CELLFIRST(...,'last') optionally returns the last element in each cell.
 
    'cellfirst --t' runs a test.
 
    Usage: y=cellfirst(x);
           [y1,y2]=cellfirst(x1,x2);
           [y1,y2]=cellfirst(x1,x2,'last');
    __________________________________________________________________
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2015 J.M. Lilly --- type 'help jlab_license' for details