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which one is the correct procedure for summation

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Renjith V Ravi
Renjith V Ravi 2017-2-13
回答： Walter Roberson 2017-2-13
I want to implement the following equation
Kindly tell me,which method is correct
ID =0;
for i=1:256
ID = ID+HD(i);
end
or otherwise
ID = sum(HD(1:256))
Please help me

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Walter Roberson
Walter Roberson 2017-2-13
ID = sum(HD(1:256)) is faster.
If you were summing large enough arrays then there could be difference in the output due to round off differences when the large summation was handed over to fast routines that use multiple threads to create partial sums that are then added together.

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