Hi you definitely shall try to get acustommed with data structures in R. You do ***not*** have numeric decimal values but factors (probably created by transfering data to R as you have in the column a value psi1). Then the assignement places a factor code into matrix instead of a factor value.
fac<-factor(rnorm(100)) daf<-as.data.frame(matrix(fac,10,10)) > sapply(daf, "is.factor") V1 V2 V3 V4 V5 V6 V7 V8 V9 V10 TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE mat[1,10]<-daf[1,10] > mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] NA NA NA NA NA NA NA NA NA 1 [2,] NA NA NA NA NA NA NA NA NA NA [3,] NA NA NA NA NA NA NA NA NA NA <snip> > mat[2,10]<-daf[2,10] mat[2,10] [1] 4 daf.n<-sapply(daf, function(x) as.numeric(as.character(x))) mat[3,10]<-daf.n[3,10] mat [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] NA NA NA NA NA NA NA NA NA 1.0000000 [2,] NA NA NA NA NA NA NA NA NA 4.0000000 [3,] NA NA NA NA NA NA NA NA NA 0.2200095 [4,] NA NA NA NA NA NA NA NA NA NA [5,] NA NA NA NA NA NA NA NA NA NA You need to get rid of irrelevant values in your data frame first. Regards Petr [EMAIL PROTECTED] [EMAIL PROTECTED] napsal dne 12.09.2007 16:03:36: > Hi, > I have some decimal values stored in a data frame (myframe) and I > need to place them in a matrix (mymatrix) using a for loop. > When I type: > > > myframe[i,10] > > I get: > > [1] 0.8714 > 434 Levels: 0 0.0134 0.1062 0.1182 0.1241 0.1322 0.1374 0.1429 > 0.1507 ... psi1 > > But when I assign that value to the matrix with: > > > mymatrix[i,2]<-myframe[i,10] > > The value that gets placed in the matrix is 286, and not 0.8714 as I > wanted it to be. What is wrong? > The data frame does have several rows of character cells interspersed > with "NA" and decimal values. It is not very simple I am just using > it to store a large output worksheet from where I want to draw > selected values. > > Thanks for any help. > > G. > > ______________________________________________ > 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.