Significant goof in my first message. Here is the corrected version: x <- 1:10 y <- 1:15 z <- outer(x,y) image(x,y,z)
xb <- c(.5,x+.5) yb <- c(.5,y+.5) image(xb,yb,z) ## xb, yb NOT x, y Fortunately, corrected one also succeeds. -Don At 8:06 AM -0700 7/15/05, Don MacQueen wrote: >I think you have it backwards (the error message not withstanding). >Read the documentation for image, note the beginning of the Details >section, and then compare these two examples, both of which succeed >on my system (R 2.1.1). > >x <- 1:10 >y <- 1:15 >z <- outer(x,y) >image(x,y,z) > >xb <- c(.5,x+.5) >yb <- c(.5,y+.5) >image(x,y,z) > >x and y provide either the centers of the cells, or the boundaries of >the cells. In the latter case, the lengths of x and y should be 1 >greater than the dim of z, not one less. > >(I'm including my full version info to be complete, but I doubt that >you problem has to do with your platform [OS]). > >-Don > >> version > _ >platform powerpc-apple-darwin7.9.0 >arch powerpc >os darwin7.9.0 >system powerpc, darwin7.9.0 >status >major 2 >minor 1.1 >year 2005 >month 06 >day 20 >language R > > >At 7:23 AM -0700 7/15/05, Pete Cap wrote: >>Hello all, >> >>Can anyone point me to a decent introduction to using the plotting >>and assorted graphics functions in R? >> >>I keep getting simple errrors and I can't figure out why, for example: >> >>> image(x,y,z) >>Error in image.default(x, y, z) : dimensions of z are not >>length(x)(+1) times length(y)(+1) >>> length(x) >>[1] 206 >>> length(y) >>[1] 40 >>> dim(z) >>[1] 207 41 >> >> >>It seems to me as if R is wrong--the matrix z is obviously of >>length(x)+1 times length(y)+1--but just as obviously I'm missing >>something essential. Are there any "newbie" guides out there for >>getting started? >>TIA, >> >>Pete >> >> >> >>--------------------------------- >> >> >> [[alternative HTML version deleted]] >> >>______________________________________________ >>[email protected] mailing list >>https://stat.ethz.ch/mailman/listinfo/r-help >>PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > > >-- >-------------------------------------- >Don MacQueen >Environmental Protection Department >Lawrence Livermore National Laboratory >Livermore, CA, USA > >______________________________________________ >[email protected] mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- -------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
