keep PC matrix 2-dimensional even if only one PC #4
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The prior code will fail when only one PC is selected because by default R will drop the singleton dimension and then the result is not an array type, so `dimnames(PCs)` generates an error. adding `drop = FALSE` to the subset keeps the singe PC as a column matrix, so everything will work.
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The prior code will fail when only one PC is selected because by default R will drop the singleton dimension and then the result is not an array type, so
dimnames(PCs)generates an error. Addingdrop = FALSEto the subset keeps the single PC as a column matrix, so everything will work.