After
a=read.table("test.txt")do this: a <- as.matrix(a)read.table() gives you a data frame. You are assuming it is a matrix, so change it into a matrix.
-Don At 3:36 PM -0800 12/2/09, aegea wrote:
Hello, I have a question on export and import data. Thank you for any suggestions. data 'simul' is generated as follows:N <- 20 n <- N/2nsets <- 10 simul <- matrix(0,nsets,N) th <- c(0,1, 1) for(i in 1:nsets){ simul[i,] <- rnorm(N,mean= rep(th[1:2],N/2),sd=th[3]) } I exported data as follows: write.table(simul, file="D:\\test.txt", row.names=F, col.names=F) When I want to use this data, I imported as follows: a=read.table("D:\\test.txt") So far, it works well. When I deal with data, I need use each row to do calculations: for(rep in 1:nsets){ y <- a[rep,] b<-c(mean(y)+3, mean(y)-4) # cannot calculate mean(y), the mean of this row m<-sd(y) # also cannot calculate sd(y) } I need a lot of calculation based on y, but after I imported data, R comes error on it. Could you please give me some suggestions? --View this message in context: http://*n4.nabble.com/calculation-problem-when-export-and-import-data-tp947250p947250.htmlSent 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.
-- --------------------------------- Don MacQueen Lawrence Livermore National Laboratory Livermore, CA, USA 925-423-1062 m...@llnl.gov ______________________________________________ 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.
