Matlab：如何将向量应用于细胞中的每个向量？

Question

if V = [3 11 20 31 40] and A=[1 2 3] , we can do V(A(:))=[3 11 20] .

How I can do that if A is a cell?

if A={[1 2 3],[2 5],[3 5]} , i want to have {[3 11 20],[11 40],[20 40]}

Answer 1

Convert A into a matrix (two ways):

V = [3 11 20 31 40]
A=[1 2 3]
V(cell2mat(A))
V([A{:}])

If A is a cell array of indices, use

cellfun(@(m) V(m),A,'UniformOutput',false)

Answer 2

使用V(cell2mat(A))=[3 11 20]或V([A{:}])=[3 11 20]

Answer 3

but if A={[1 2 3],[2 5],[3 5]} and i want to have {[3 11 20],[11 40],[20 40]}?

I don't think there is a way to properly vectorize this problem, but you can at least use cellfun to get it into one line. It's not going to be especially fast, but at least it's concise... ish.

cellfun(@(x) V(x), A, 'UniformOutput', false)