Repeat values in a vector

2018 10 16
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更新时间：2018 10 17
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Assume
a1=[1 5 8];
b1=[6 4 5];
a2=[1 2 3 4 5 6 7 8];
Now I want to create a matching vector with values repeated as follows:
b2=[6 6 6 6 4 4 4 5];
Thanks in advance!

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Kevin Chng
Kevin Chng 2018-10-16
Have you tried it?
KSSV
KSSV 2018-10-16
编辑：KSSV 2018-10-16
Whats the logic behind b2? If it is a mere repeating...read about repelem and repmat.

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Andrei Bobrov
Andrei Bobrov 2018-10-16

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b2 = b1(cumsum(ismember(a2,a1)));

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Florian
Florian 2018-10-16
Many thanks Andrei, also for answering my other question!

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Bruno Luong
Bruno Luong 2018-10-16
编辑：Bruno Luong 2018-10-16

1 个投票

Another method:
[~,loc] = histc(a2,a1);
b2 = b1(loc)
yet another one
b2 = b1(interp1(a1,1:length(a1),a2,'previous'))

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