Hi, I want to extract elements of an array (say, a) that are contained in another array (say, b). That is, if a=array([1,1,2,3,3,4]), b=array([1,4]), then I want array([1,1,4]).
I did the following but the speed is very slow (maybe because a is very long): c=array([]) for x in b: c=append(c,a[a==x]) any way to speed it up? Thanks! -Ning
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