Turn pixels in connected components to zero based on logical array

2018 12 29
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I want to switch all pixels in connected components to zero, based on a logical array.
I have CC.PixelIdxList obtained from bwconncomp performed on binary image BW.
I have a logical array, X, the size of CC.PixelIdxList, based on which I would like to turn pixels in CC.PixelIdxList{y} to zero if the value in X=0 at index y.
I tried this:
BW(CC.PixelIdxList{y}) =X;
where y is just an array of numbers from 1 to the size of CC.PixelIdxList.
But it is not working, there must be another way that I cant think of.
Appreciate any suggestions. Thanks.

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