sampling from a matrix
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José-Luis
2013-12-20
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);
更多回答(1 个)
dpb
2013-12-20
编辑:dpb
2013-12-20
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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