adding vector entry after each element

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Richard
Richard 2012-8-15
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

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Matt Fig
Matt Fig 2012-8-15
编辑：Matt Fig 2012-8-15
x = [1,2,3,4,5,6];
y = cumsum(x)
y = y(2:end) % To match your example....

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Sean de Wolski
Sean de Wolski 2012-8-15
And just for fun:
filter(x(2:end),1,ones(1,numel(x)-1))+x(1)
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Matt Fig
Matt Fig 2012-8-15
编辑：Matt Fig 2012-8-15
While we're on the topic of ridiculously inefficient alternatives to CUMSUM, ;-)
sum(triu(toeplitz(x(2:end))))+x(1)

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