Compute the complement of a set of indices in a known range

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Brando Miranda 2016-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/277084-compute-the-complement-of-a-set-of-indices-in-a-known-range

编辑： Brando Miranda 2016-4-6

I want to compute the complement of a set C. The elements are indices in the range 1 to K. Is the best/fastest/simplest way to go around this is using

C = setdiff(A,B)

or since I know they are not arbitrary sets of numbers, is there a better way to go around in MATLAB?

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Azzi Abdelmalek 2016-4-4

What do you mean? can you clarify what "not arbitrary sets of numbers" means, with a small example

Brando Miranda 2016-4-6

编辑：Brando Miranda 2016-4-6

I just have susbets from a set of indices. So A Union B is the same as 1 to K. So the sets A and B are always in a predefined set of indices 1 to K. An example would be A=[1,2,5] and B=[3,4].

But I wouldn't get as input A=[0.1, 0.2], B = [0.5] since that is not a valid index range in question.

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