How do I pass extra known parameters to arrayfun?

2021 8 6
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For example, if I want to find the position in the corresponding array b from each element of array a, how should I write the code?
a = [1,2,3];
b = [2,1,1,3,1,2];
idx = arrayfun(@(x,b)find(x==b),a,b)
Error using arrayfun
All of the input arguments must be of the same size and shape.
Previous inputs had size 3 in dimension 2. Input #3 has size 6
The desired idx outcome is：{[2,3,5],[1,6],[4]}

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xingxingcui
xingxingcui 2021-8-6
编辑：xingxingcui 2021-8-6
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I get the answer:
a = [1,2,3];
b = [2,1,1,3,1,2];
idx = arrayfun(@(x)find(x==b),a,'UniformOutput',false)
idx = 1×3 cell array
{[2 3 5]} {[1 6]} {[4]}

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