Create an array whose values depend on another array

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luca
luca 2019-7-26
评论： luca 2019-7-26
If I have an array like
C = [1 2 3 4 5 2 4 5 6 7 6 2 5 7 8]
I would like to obtain another array where the value of :
1,4,7 are substitued with 1.
2,5 with 2
3,6,8 with 3
to obtain:
F = [1 2 3 1 2 2 1 2 3 1 3 2 2 1 3]
F should be a numeric vector and not a string or a character.
Which is the fastest and most efficient way?

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KALYAN ACHARJYA
KALYAN ACHARJYA 2019-7-26
编辑：KALYAN ACHARJYA 2019-7-26
C=[1 2 3 4 5 2 4 5 6 7 6 2 5 7 8]
F=C;
idx=find(C==1 | C==4 | C==7);
F(idx)=1;
idx=find(C==2 | C==5);
F(idx)=2;
idx=find(C==3 | C==6 | C==8);
F(idx)=3;
F
Commad Window:
C =
1 2 3 4 5 2 4 5 6 7 6 2 5 7 8
F =
1 2 3 4 2 2 4 2 3 1 3 2 2 1 3
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