Statistical method to arrange a set of variables in subsets
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Nourhan Elsayed
le 13 Oct 2020
Commenté : Ameer Hamza
le 14 Oct 2020
dear all
i have a general mathematical question
i have an array of different numbers. size of the array is 16 x 6. i want to form a subset of a vector of size 1 x6 . each element of the vector is selected from the column that have the same index as this element .
example:
master Array is =
a1 b1 c1 d1 e1 f1
a2 b2 c2 d2 e2 f2
a3 b3 c3 d3 e3 f3
.
.
.
a16 b16 c16 d16 e16 f16
subset = a1 b2 c4 d3 e3 f13
all subsets must be on the order of a'b'c'd'e'f
what is the method that can form all possible subsets combined of the given master array. and what are the statistical therories that are applied to this sience of data sorting
3 commentaires
Ameer Hamza
le 13 Oct 2020
16^6 combinations exist after excluding non-''a,b,c,d,e,f,g'' combinations.
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Ameer Hamza
le 13 Oct 2020
This code shows how to generate all combinations as you mentioned in your question
M = rand(16, 6); % example
rows = cell(1,6);
[rows{:}] = ndgrid(1:16);
rows = cellfun(@(x) {x(:)}, rows);
rows = [rows{:}];
cols = repmat(1:6, size(rows,1), 1);
idx = sub2ind(size(M), rows, cols);
M_out = M(idx);
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