Hi Eric, Thanks, it works. If I want to convert the matrix to the 1-D vector for the levelplot, should I use the command below? I thought the t() is a reverse function, but may be not.
values <- layer$z values.v <- as.vector(t(values)) On Tue, Jan 16, 2018 at 12:36 AM, Eric Berger <ericjber...@gmail.com> wrote: > If layer$z is a matrix and you want to reverse the order of the rows, you > can do: > > n <- nrow(layer$z) > layer$z <- layer$z[ n:1, ] > > HTH, > Eric > > > On Tue, Jan 16, 2018 at 8:43 AM, lily li <chocol...@gmail.com> wrote: > >> Sorry for the emails, I just wanted to have an example. >> layer$z >> >> 1 1 3 4 6 2 >> 2 3 4 1 2 9 >> 1 4 5 2 1 8 >> >> How to convert the matrix to layer$z = c(1, 4, 5, 2, 1, 8, 2, 3, 4, 1, 2, >> 9, 1, 1, 3, 4, 6, 2)? >> I think this vector is the order that levelplot can use. Thanks again. >> >> >> On Mon, Jan 15, 2018 at 10:58 PM, lily li <chocol...@gmail.com> wrote: >> >> > Hi Bert, >> > >> > I think you are correct that I can use levelplot, but I have a question >> > about converting data. For example, the statement: >> > levelplot(Z~X*Y), Z is row-wise from the lower left corner to the upper >> > right corner. >> > My dataset just have gridded Z data as a txt file (or can be called >> > matrix?), how to convert them to the vector in order for levelplot to >> use? >> > Thanks. >> > >> > On Mon, Jan 15, 2018 at 6:04 PM, Bert Gunter <bgunter.4...@gmail.com> >> > wrote: >> > >> >> From your description, I am **guessing** that you may not want a >> "spatial >> >> map" (including projections) at all, but rather something like a level >> >> plot. See ?levelplot in the lattice package for details. Both I am sure >> >> ggplot2 has something similar. >> >> >> >> Apologies if I havemisunderstood your intent/specifications. >> >> >> >> Cheers, >> >> Bert >> >> >> >> >> >> Bert Gunter >> >> >> >> "The trouble with having an open mind is that people keep coming along >> >> and sticking things into it." >> >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) >> >> >> >> On Mon, Jan 15, 2018 at 4:54 PM, lily li <chocol...@gmail.com> wrote: >> >> >> >>> Hi Roman, >> >>> >> >>> Thanks for your reply. For the spatial coordinates layer, I just have >> >>> coordinates of the upper left corner, numbers of rows and columns of >> the >> >>> spatial map, and grid cell size. How to create a spatial layer of >> >>> coordinates from this data? Thanks. >> >>> >> >>> >> >>> On Mon, Jan 15, 2018 at 3:26 PM, Roman Luštrik < >> roman.lust...@gmail.com> >> >>> wrote: >> >>> >> >>> > You will need to coerce your data into a "spatial" kind, as >> >>> implemented in >> >>> > `sp` or as of late, `sf` packages. You might want to give the >> >>> vignettes a >> >>> > whirl before you proceed. >> >>> > Roughly, you will have to coerce the data to Spatial* (you could go >> >>> for a >> >>> > point, raster or grid type, I think) and also specify the >> projection. >> >>> Once >> >>> > you have that, plotting should be handled by packages. >> >>> > >> >>> > Here are a few quick links that might come handy: >> >>> > >> >>> > https://cran.r-project.org/web/views/Spatial.html >> >>> > http://www.datacarpentry.org/R-spatial-raster-vector- >> >>> > lesson/10-vector-csv-to-shapefile-in-r/ >> >>> > >> >>> > >> >>> > Cheers, >> >>> > Roman >> >>> > >> >>> > On Mon, Jan 15, 2018 at 11:22 PM, lily li <chocol...@gmail.com> >> wrote: >> >>> > >> >>> >> Hi users, >> >>> >> >> >>> >> I have no clear clue about plotting spatial data. For example, I >> just >> >>> >> have a table with attribute values of each grid cell, such as >> >>> elevation. >> >>> >> Then I have coordinates of the upper left corner in UTM, the number >> >>> of rows >> >>> >> and columns, and grid cell size. How to create spatial plot of >> >>> elevations >> >>> >> for the grid cells, in color ramp? Should I create a spatial grid >> >>> layer >> >>> >> with all the polygons first? Thanks. >> >>> >> >> >>> >> -- >> >>> >> -- >> >>> >> You received this message because you are subscribed to the ggplot2 >> >>> >> mailing list. >> >>> >> Please provide a reproducible example: >> https://github.com/hadley/devt >> >>> >> ools/wiki/Reproducibility >> >>> >> >> >>> >> To post: email ggpl...@googlegroups.com >> >>> >> To unsubscribe: email ggplot2+unsubscr...@googlegroups.com >> >>> >> More options: http://groups.google.com/group/ggplot2 >> >>> >> >> >>> >> --- >> >>> >> You received this message because you are subscribed to the Google >> >>> Groups >> >>> >> "ggplot2" group. >> >>> >> To unsubscribe from this group and stop receiving emails from it, >> >>> send an >> >>> >> email to ggplot2+unsubscr...@googlegroups.com. >> >>> >> For more options, visit https://groups.google.com/d/optout. >> >>> >> >> >>> > >> >>> > >> >>> > >> >>> > -- >> >>> > In God we trust, all others bring data. >> >>> > >> >>> >> >>> [[alternative HTML version deleted]] >> >>> >> >>> ______________________________________________ >> >>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> >>> https://stat.ethz.ch/mailman/listinfo/r-help >> >>> PLEASE do read the posting guide http://www.R-project.org/posti >> >>> ng-guide.html >> >>> and provide commented, minimal, self-contained, reproducible code. >> >>> >> >> >> >> >> > >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide http://www.R-project.org/posti >> ng-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
