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How to find position of a time vector in another time vector?

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roudan
roudan 2017-12-12
评论： Jan 2017-12-12
Hi
I have two time vectors, one has random time spacing like A=[' 01/01/2001', '05/01/2001, ....], the other time vector has daily time like B=[' 01/01/2001', '01/02/2001', ....]. I like to find a position of each element of A in vector B. What is the fastest way? I don't want to write a loop for find each element. is there a faster way to output a position vector directly? Thanks a lot. I appreciate your help.
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Jan
Jan 2017-12-12
编辑：Jan 2017-12-12
What exactly is a "time vector"?
A=[' 01/01/2001', '05/01/2001]
is the same as:
A = ' 01/01/200105/01/2001'
So it is not clear, what your inputs are. Does the leading space have a meaning? Is it a cell string or a datetime object?

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Jan
Jan 2017-12-12
While I'm not sure what your inputs are, most likely this will solve the problem:
[ex, loc] = ismember(A, B)
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roudan
roudan 2017-12-12
Thanks Jan. That works perfectly. I also found solution like this which has same result. idxs =arrayfun(@(x)find(B==x,1),A)

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