Get array of elements based on occurrences of another vector

Question

0 个投票

Hi guys!

Let's assume that you have 2 Nx1 arrays "y" and "x", is there a way to find all the elements of y corresponding to the unique elements of x?

E.g

y=[0;1;2;3;4];
x=[1;1;2;2;2];
%The results should be two vectors, one containing the elements [0;1] and the other one containing
%[2;3;4]

Thank you!

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Answer 1

Torsten 2022-9-9

1 个投票

y=[0;1;2;3;4];
x=[1;1;2;2;2];
z{1} = y(x==1);
z{2} = y(x==2);
z{1}
ans = 2×1
     0
     1
z{2}
ans = 3×1
     2
     3
     4

Answer 2

Matt J 2022-9-9

1 个投票

y=[0;1;2;3;4];
x=[1;1;2;2;2];
z=splitapply(@(x){x},y,x);
z{:}
ans = 2×1
     0
     1
ans = 3×1
     2
     3
     4