On 13 Jan 2003 at 18:22, Saurav Pathak wrote: > Hi, > > I am trying to plot densities given on a two dimensional grid. My > data is in the an external file, and is arranged in three columns: > x, y, density > > how may i get a plot of this? i would like to get (1) a three > dimensional plot and (2) a color coded two dimensional plot. > > I have tried using > > image(x, y, density)
You have here x, y, density vectors of the same length, which is not what image expects. The help page for image tells you that x and y should be vectors (each in ascending order), and z a matrix with dimensions length(x) and length(y). See the example on the help page for image. If your data are not a rectangular grid, you must probably interpolate before you can use image. Kjetil Halvorsen > > but i am asked to put the data in ascending order. i am not sure > how i may put grid points in an ascending order. > > I would also like to know if i could use any other function, other > than image. > > thank you in advance. > > -- > saurav > > ______________________________________________ > [EMAIL PROTECTED] mailing list > http://www.stat.math.ethz.ch/mailman/listinfo/r-help ______________________________________________ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
