sampling from a matrix
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Hello I am going to sample some columns in a matrix and return the columns that are not selected during the sampling. could you please help me?
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José-Luis
le 20 Déc 2013
bla = rand(10);
%Columns you sample:
my_cols = [1 5 7];
%Extract them:
sample = bla(:,my_cols);
nCols = 1:size(bla,2);
no_sample = nCols(~ismember(nCols,my_cols));
no_sample =bla(:,no_sample);
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dpb
le 20 Déc 2013
Modifié(e) : dpb
le 20 Déc 2013
Sample how? If use randperm, say, as
icol=randperm(size(x,2),N);
to select N random columns from the array x to get the "nonsampled" columns you could instead simply use
inot=randperm(size(x,2),size(x,2)-N);
which is simply picking a random set of the obverse size to not sample--same thing in the end.
Or, if you are using the sampled column values first and then wanting the ones that weren't used both then first select as in the former and the other columns are simply
inot=setdiff([1:size(x,2)],icol);
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