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...ion: Warning message: In log(x) : NaNs produced I dont know what happened there, is there a way to find the value for f(x[i]) that R can't determine TRUE/FALSE? Thanks! casper -- View this message in context: http://r.789695.n4.nabble.com/how-to-see-what-s-wrong-with-a-self-written-function-tp3159528p3159528.html Sent from the R help mailing list archive at Nabble.com.