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...ing. > integrate(int,lower=0.0001,upper=10,s=2) Error in P[1, 1] = exp(-th) : number of items to replace is not a multiple of replacement length I've searched the internet, but I haven't been able to find a solution to this yet. Does anyone have a clue? Thanks in advance! Frank van Berkum -- View this message in context: http://r.789695.n4.nabble.com/Integration-problem-error-in-invoking-an-outside-function-tp2255862p2255862.html Sent from the R help mailing list archive at Nabble.com.

...then I get the error message: Error in `[.data.frame`(Cars, Cars$s != 0) : undefined columns selected # If I try s[s!=0] # I do get the positive s-values, but how can I get all colums in a matrix? Does anyone know how this can be done? Your help would be greatly appreciated. Regards, Frank van Berkum -- View this message in context: http://r.789695.n4.nabble.com/Extract-rows-with-non-zero-elements-tp2125128p2125128.html Sent from the R help mailing list archive at Nabble.com.