Padding arrays with zeros dynamically - Octave / Matlab -

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i have add multiple arrays in loop , arrays in size need pad array x , need pad array y how can have arrays padded dynamically?

i know how pad manually (see code below) how can dynamically if size of array x or size of array y vary? 

x = [1 2 3 4 5 6]' y = [3 5 7 8]';  = x + [y;zeros(2,1)];  result in = [4 7 10 12 5 6]'

ps: i'm using octave 3.8.1 matlab

find max length , pad both of them difference.

l = max(length(x), length(y)); = [x; zeros(l-length(x),1)] + [y; zeros(l-length(y),1)];

it can extended more 2 vectors:

l = max(length(x), length(y), length(z)); = [x; zeros(l-length(x),1)] + [y; zeros(l-length(y),1)] + [z; zeros(l-length(z),1)];

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