To find values by using position vector
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Suppose matrix A=[1 3 5 7 9]. The position vector is known, which is, say, B=[ 3 4 ]. So the intended answer should be [ 5 7 ] which are elements at the 3rd and 4th places. Is there a function to achieve this? In fact the matrix A is high dimensional and there are many position vectors, and for loops seem not the most effective way...
Thanks in advance.
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