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Adding all previous to create a new row

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Hendrik
Hendrik 2012-12-11
Hello, if i have a row, I want to create a new row, where the first number is the same, the second number is the first and second from previous row. The third number is the first plus the second plus the third from the first row.
for example: x=[10 9 8 7 6 5] then i want the new row to become: y = [10 19 27 34 40 45]
The best I could come up with was:
y=[x]+[0,x(1:end-1)]+[0 0,x(1:end-2)]+....+[0 0 0 0 0,x(1:end-5)]
But there has to be an easier wawy, since this only works for short rows

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Honglei Chen
Honglei Chen 2012-12-11
编辑：Honglei Chen 2012-12-11
You can use cumsum
y = cumsum(x)
You can also do
filter(ones(1,numel(x)),1,x)

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