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How can I sum row element to the end?

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zeezo
zeezo 2018-3-1
回答： Walter Roberson 2018-3-1
I have this matrix "a" and it size is changeable and I need to sum all elements then I the sum from the second elements to the end than the third element to the end and so on
I tired this for loop but does not
a=[2; 3; 8; 2];
[row,column]=size(a);
for i=1:row
y=sum (a(i,1),end) ;
tt(i,1)=y;
end
tt
The code I want it to work if I change the matrix "a" size

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回答（1 个）

Walter Roberson
Walter Roberson 2018-3-1
sum(a)-[0;cumsum(a(1:end-1))]

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