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vectorB(n) = sum(vectorA(1:n)) without a loop

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Christian Tieber
Christian Tieber 2019-9-2
评论： Christian Tieber 2019-9-4
I would like to do:
vectorB(n) = sum(vectorA(1:n))
without a loop.
Thanks in advance

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madhan ravi
madhan ravi 2019-9-2
编辑：madhan ravi 2019-9-2
Perhaps you just want cumsum()
help cumsum
doc cumsum
Or you just need:
v= accumarray(n(:),n(:),[],@(x) sum(vectorA(1:x)));
Wanted = v(n);
% or
Wanted = arrayfun(@(x) sum(vectorA(1:x)),n)

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