Hi r-help-boun...@r-project.org napsal dne 13.08.2010 13:50:20:
> For the query below I have also included the follwing information. Thanks for > your replies > > > str(FeaturePresenceMatrix) > chr [1:65530, 1:40] "0" "0" "0" "0" "1" "0" "0" "0" "0" ... > - attr(*, "dimnames")=List of 2 > ..$ : chr [1:65530] "4" "5" "6" "7" ... > ..$ : chr [1:40] "X1" "X2" "X3" "X4" ... > > ?class > > class(FeaturePresenceMatrix) > [1] "matrix" > > Amit Patel wrote: > > > Hi > > I am trying to calculate the row sums of a matrix i have created > > The matrix ( FeaturePresenceMatrix) has been created by > > > > 1) Read csv Result shall be data frame > > 2) Removing unnecesarry data using [-1:4,] command Rows 1:4 were probably non numeric so all data appeared non numeric. and see difference -1:4 -(1:4) > > 3) replacing all the NA values with as.numeric(0) and all others with > >as.numeric (1) Here you changed your data frame to matrix somehow which will than become non numeric. Beside rowSums behaves nicely wit NAs through na.rm=TRUE argument, so there is no need to change NA to zero. Use is.na function instead if you want to count non NA elements rowSums(!is.na(some.matrix)) Regards Petr > > > > When I carry out the command > > > > TotalFeature <- rowrowSums(FeaturePresenceMatrix, na.rm = TRUE) > > > > I get the following error. > > Error in rowSums(FeaturePresenceMatrix, na.rm = TRUE) : 'x' must be numeric > > > > Any tips onhow I can get round this? > > Yes, follow the posting guide and give the list a reproducible > example. We don't know a critical piece of information, > the class of your data. We know it's *not* numeric though, > which is what it needs to be. Use ?class, ?str, and > possibly give us a small sample with ?dput. That way, we can > reproduce the error. > > > > > > ______________________________________________ > 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.