hi, because of my ignorance I can't figure out why would you need such a structure. However the following trick works:
> a <- matrix(1:6,3) > b <- data.frame(1:3) > b$a <- a > b X1.3 a.1 a.2 1 1 1 4 2 2 2 5 3 3 3 6 > names(b) [1] "X1.3" "a" > class(b$a) [1] "matrix" > is.matrix(b$a) [1] TRUE hope that's help PF 2011/6/27 新鼎-智慧製造事業處-鄭紹文 <shaowench...@acs.com.tw>: > Dear sir, > > If I have a vector as: >>y <- c(1:4) > and a matrix as: >>x <- matrix (5:12, nrow=4, ncol=2) > > Then I create a data frame as: >>t <- data.frame(y, x) > > R will generate a data frame of 3 columns >>names(t) >> "y" "X1" "X2" >>is.vector(t$X1) returns TRUE >> is.vector(t$X2) returns TRUE > R splits the columns of a matrix into column vectors automatically. > > How should I create a data frame of t$y & t$x such that >>is.vector(t$y) returns TRUE >>is.matrix(t$x) returns TRUE > That is, how to make x column of the data frame a matrix? Just like the test > data ¨gasoline〃 in your PLS package: >>library(pls) >>data(yarn) >>is.vector(density) returns TRUE >>is.matrix(NIR) returns TURE (NIR is a matrix) > > Best regards, > Shaowen Cheng > > ________________________________ > The information in this e-mail may be confidential; it is intended for use > solely by the individual or entity named as the recipient hereof. Disclosure, > copying, distribution, or use of the contents of this e-mail by persons other > than the intended recipient may violate applicable laws and if you have > received this e-mail in error, please delete the original message and notify > us by collect call immediately. Thank you. > > [[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. > > -- +----------------------------------------------------------------------- | Patrizio Frederic, | http://www.economia.unimore.it/frederic_patrizio/ +----------------------------------------------------------------------- ______________________________________________ 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.
