Difference between the usage of sum functions

2018 10 17
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更新时间：2018 10 17
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Hey, can someone explain, why the results are different? And which way is the right one? Thanks.
X=A+B+C-D;
Sum1=sum(X)
Sum2=sum(A)+sum(B)+sum(C)-sum(D)

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madhan ravi
madhan ravi 2018-10-17

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SUM1 is the right one.
It calculates your resultant matrix’s sum
But the latter calculates the sum o each matrices and does the arithmetic operations but then also it depends on your wish.

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