Vector sum by index

Hello

I want the sum of a vector by index, means I want to get the sum of all indicies until the current index plus the current index?

X = [1 , 4, 7, 10]

Output:

X_output = [1, 5, 12, 22 ]

Index1 = 1

Index2 = 1 + 4 = 5

Index3 = 1 + 4 + 7 = 12

Index4 = 1 + 4 + 7 + 10 = 22

Thanks!

Answer 1

[madhan ravi]

cumsum()

Answer 2

[KSSV]

Using loop:

x = [1 4 7 10] ; 
thesum = zeros(size(x)) ; 
thesum(1) = x(1) ; 
for i = 2:length(x)
  thesum(i) = sum(x(1:i)) ; 
end

For inbuilt function read about cumsum.