Hello Alok, We really need more details about what you are trying to acheive in order to help you.
c(X, Y) concatenates the objects X and Y. The result will be a vector. If X and Y happen to be m x n matrices, the result will be a vector of length 2 * m * n: probably not what you want. You can see this for yourself. Eg: X <- matrix(1, 3, 3) Y <- matrix(2, 3, 3) c(X, Y) If you were hoping to combine the information in corresponding pixels of the matrices X and Y, you will need to have a clear idea of *how* you would like the information to be combined. ie: Are you looking for the mean value of the pixels, or is some other operation required? Eg 2: X <- matrix(1:9, 3, 3) Y <- matrix(2, 3, 3) X + Y / 2 Hope that helps. Greg 2009/1/7 Alok K. Bohara, PhD <boh...@unm.edu> > Hi: > > Let me start by saying that I am new to R. I converted two pixel ascii > matrices into image files: > > X_im <- im(X) # X is an ascii pixel matrix > Y_im <- im(Y) # Y is an ascii pixel matrix > > How can I combine these two images into 1) one datafile "XY_im", 2) save it > and 3) read it after loading (e.g., x <- XY_im$X_im. and plot it.) > > I tried doing this: > > XY_im <- c(X_im,Y_im) > save(XY _im, file = "XM_im.Rdata") > load("XY_im.Rdata") > x<- XY_im$X_im # It does not like $ and says it is atomic something... > plot(x) # of course it does not work either. > > What am I doing wrong? Any tips? > > Thanks you. > > Alok Bohara > > > -- > Alok K. Bohara, Ph.D. > Professor > Department of Economics > University of New Mexico > Albuquerque, NM 87131,USA > Ph: 505-277-5903/5304(w) > Fax:505-277-9445 > email: boh...@unm.edu > http://www.unm.edu/~econ/faculty/professors.html > Nepal Study Center: http://nepalstudycenter.unm.edu > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > [[alternative HTML version deleted]] _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo