loop vs bit manipulation: some difference decimal

[LucaLuca]

hi,
i did exercise...
i create 2 code egual but tghe first with loop and the second with bit
manipulation

1)
E(1,1:columns(D))=D(1,:);

tic
for gg=2:rows(D)
  for yy=1:columns(D)

    E(gg,yy)=E(gg-1,yy)+D(gg,yy); %Singola equity per ciascun sistema   
endfor
endfor

2)

f=flip(triu(ones(size(D)(1))));

E2 = f*flip(D);


i try to write difference:

E-E2


https://gyazo.com/1c201c2b59efc73814ef3d8bd98032db

I found that on decimals it has small differences







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