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Split array based on given indices

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I want to split one array into two based on given indices. Specifically, have two arrays, one array A with data (3 columns) and one B with indices.
eg A = [10 11 12 13 14 15 16 17 18 19 20], B = [3 4 5 8 9 10]
As a result, I want two new arrays C and D where C includes all values in A on given indices in B and D including the rest.
eg C = [12 13 14 17 18 19], D = [10 11 15 16 20]
For now, I'm having a loop (check for i in B with ismember and append value in A to array C/D accordingly) but since I have a lot of data, it takes quite long. Any help is appreciated, I know that there is a arrayfunction for everything in matlab.

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