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how to sum each element in vector

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Jeah MK 2022-1-28

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回答： DGM 2022-1-28

I have a vector a = 1:1:10;

I want to make a vector by sum each elements; for example, s = [1+0 1+2 3+3 6+4 10+5 ...... ];

I use loop, but it doesn't give me a vector.

a = 1:1:10;

s = 0;

for i=1:length(a)

s = s + a(i);

end

thank you

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DGM 2022-1-28

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a = 1:1:10; 
% you could do it with a loop
s = zeros(1,numel(a)); 
s(1) = a(1);
for i = 2:numel(a)
    s(i) = s(i-1) + a(i); 
end
s
s = 1×10
     1     3     6    10    15    21    28    36    45    55
% or you could just do 
s = cumsum(a)
s = 1×10
     1     3     6    10    15    21    28    36    45    55

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