how to extract matrix column and make new matrixes from the extracted column?
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how to extract matrix column and make new matrixes from the extracted column? if you name the column a, b, and c then i want to create matrixes which consist of
a
b
c
ab
ac
bc
abc
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Answers (2)
Image Analyst
on 1 Nov 2011
a = fullMatrix(:, colA); % colA is whatever column number "a" is in. It's an integer.
b = fullMatrix(:, colB);
c = fullMatrix(:, colC);
ab = fullMatrix(:, colAB);
ac = fullMatrix(:, colAC); % etc.
% Concatenate
newColVector = [a;b;c;ab;ac;bc;abc]
2 Comments
Walter Roberson
on 1 Nov 2011
Where YourMatrix is your existing matrix with all columns, and the number of columns is at most 52 (or is it 53?)
ncols = size(YourMatrix,2);
numoutputs = 2^ncols;
TheOutputs = cell(numoutputs,1);
for K = 1 : numoutputs
TheOutputs{K} = YourMatrix(:,dec2bin(K-1,ncols) == '1');
end
If you are enthusiastic about the leading columns being chosen first, then you can fliplr() the result of the comparison.
Do not be surprised if at the creation of TheOutputs you get an error about the size of the cell array being too big to handle. If that happens, you can comment out that line as it is just an optimization.
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