how to find index of 50% of sum of signal?

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benghenia aek
benghenia aek 2021-11-26
回答： Image Analyst 2021-11-27
how to find index of 50% of sum of signal
a=[4 2 3 1 5 6 11];
sum(a)=32
50% of sum signal =16
indice which is approximately equal to of sum of 50% of sum signal a is 5

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回答（2 个）

Walter Roberson
Walter Roberson 2021-11-26
Hint:
4, 2, 3, 1, 5, 6, 11
4, 4+2, 4+2+3, 4+2+3+1, 4+2+3+1+5, 4+2+3+1+5+6, 4+2+3+1+5+6+11 -->
4, 6, 9, 10, 15, 21, 32
4<=32/2, 6<=32/2, 9<=32/2, 10<=32/2, 15<=32/2, 21<=32/2, 32<=32/2 -->
true, true, true, true, true, false, false
1 2 3 4 5
Image Analyst
Image Analyst 2021-11-27
Isn't this a duplicate?
If it's not your homework, you can use my solution:
a=[4 2 3 1 5 6 11];
s = sum(a)
c = cumsum(a)
[minDiff, index] = min(abs(c - s/2))
If it is your homework, tag it as homework and find a different way.

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