Nested Loop, Can someone help me to understand this code?

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Kaouthar Bouyaouzan
评论： Kaouthar Bouyaouzan 2021-2-4
Inspect the (basic) functionality of the cumsum function, then implement your own (mycumsum). Only implement the functionality of the first 3 documentation lines, not all the special cases!
function Y = mycumsum(X)
%MYCUMSUM cumulative sum of elements.
Y = X;
[r,c] = size(Y);
for ii = 2:r
for jj = 1:c
Y(ii,jj) = Y(ii,jj) + Y(ii-1,jj);
end
end
end
Can someone help me to understand this code?

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采纳的回答

David Hill
David Hill 2021-2-3
function Y = mycumsum(X)
Y = X;
[r,c] = size(Y); %determine size of maxtrix
for ii = 2:r %1st row will stay constant, start at 2nd row
for jj = 1:c %go through all columns
Y(ii,jj) = Y(ii,jj) + Y(ii-1,jj); %first step Y(2,1)=Y(2,1)+Y(1,1) then Y(3,1)=Y(3,1)+Y(2,1),... this is the cumulative add of column
end
end
end

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