Utility function for converting copynumber units (2 is normal) to log2ratio units (two is normal). If ploidy is provided lr is log2(cn/ploidy), otherwise log2(cn/2).
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numeric vector or matrix, or DataFrame with numeric-like columns (Rle typicaly). Assumed to be in copynumber units.
numeric, of length ncol(x). Ploidy of each sample.
data of same type as 'x' transformed into log2ratio units
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