Try this (not a lot of error checking -- assumes values 1-5 are in the matrix and in my.id):
new.matrix <- my.df$my.value[match(my.matrix, my.df$my.id)] dim(new.matrix) <- dim(my.matrix) On Nov 23, 2007 4:13 PM, Milton Cezar Ribeiro <[EMAIL PROTECTED]> wrote: > Dear all, > > I have a matrix which values varying from 1 to 5. > I also have a table with a column that match with matrix values (=my.id). > > my.matrix<-matrix(sample(1:5,100,replace=T),nc=10) > image(my.matrix) > > my.df<-data.frame(cbind(my.id=1:5,my.value=c(0.1,0.3,0.2,0.9,1))) > my.df > > How can I create a new matrix, where the values of this matrix is my.value > when the value of my.matrix match with my.df$my.id > > I can do it in a for() looping, but my matrix are so big (2000 x 2000) and I > need to it about 1,000 times. > > Thanks in advance, > > Miltinho > > > > para armazenamento! > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? ______________________________________________ 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.
