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find most variable genes on microarray dataset

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as nem
as nem 2016-4-7
回答： Walter Roberson 2016-4-7
Hi All, I have a 203*12600 where 12600 gene and 203 sample microarray dataset. And,I made some preporessing steps on microarray dataset. treshold, filtering and Log 10 transform. Then now, I want to find most variable genes (which have high variance) and select first 500 genes. How can I do this ? Can anyone help.

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Walter Roberson
Walter Roberson 2016-4-7
gvar = var(YourArray);
[most_var, varidx] = sort(gvar, 'descending');
var500idx = varidx(1:500);
var500samples = YourArray(:,var500idx);

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