Tena koe Marcio Try something like (untested)
apply(yourMatrix, 1, function(x) sum(x[x!=9])) HTH ... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of Marcio Resende > Sent: Thursday, 26 November 2009 9:27 a.m. > To: r-help@r-project.org > Subject: [R] How to sum only a few elements in a line > > > Hello, > > I have a matrix with the numbers 0,1 and 9 I would like to > write a function that could sum each line skiping everytime a > number 9 appears for example [0 1 0 1 1 9 1] the sum would be 4. > However I cannot replace 9 by 0 otherwise after the sum is > done I wouldn´t be able to distiguish which ones were real > zeros and which ones were nines replaced by zero just to sum. > Thank you very much > > -- > View this message in context: > http://old.nabble.com/How-to-sum-only-a-few-elements-in-a-line > -tp26519740p26519740.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
