searching array position in matrix

[LucaLuca]

i've following matrix:

df=[3 4 5;9 3 4; 9 3 5]

i've index array nn=[2 3 1]

how can i get element df matrix in nn position ?

ans= 
4 ==>position 1 of nn ==>nn(1)
4==> position 2 of nn ==>nn(2)
9==> position 3 of nn==>nn(3)



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