adding vector entry after each element

This is a very basic question but how would I add the elements of a vector like so...:

x = [1,2,3,4,5,6];

ans = 3 6 10 15 21

Answer 1

[Matt Fig]

x = [1,2,3,4,5,6];
y = cumsum(x)
y = y(2:end)  % To match your example....

Answer 2

[Sean de Wolski]

And just for fun:

 filter(x(2:end),1,ones(1,numel(x)-1))+x(1)

[Matt Fig]

While we're on the topic of ridiculously inefficient alternatives to CUMSUM, ;-)

sum(triu(toeplitz(x(2:end))))+x(1)