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/fingerprint/R/bitimp.R

http://github.com/rajarshi/cdkr
R | 13 lines | 11 code | 2 blank | 0 comment | 0 complexity | 2c642bc1f05561df93d2c76a9fae1748 MD5 | raw file
  1. bit.importance <- function(actives, background) {
  2. bs.actives <- bit.spectrum(actives)
  3. bs.background <- bit.spectrum(background)
  4. m <- length(actives)
  5. n <- length(background)
  6. pa <- (m*bs.actives+bs.background)/(m+1)
  7. pb <- (n*bs.background+bs.actives)/(n+1)
  8. kl <- pa * log(pa/pb) + (1-pa) * log( (1-pa)/(1-pb) )
  9. kl[is.nan(kl)] <- NA
  10. return(kl)
  11. }