> -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]] On Behalf Of kjetil > brinchmann halvorsen > Sent: den 14 januari 2003 14:08 > To: [EMAIL PROTECTED]; Saurav Pathak > Subject: Re: [R] density plot - beginner's question > > > 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.
The code example at http://www.maths.lth.se/help/R/image/ might also shine some light on the image() function, especially on how the coloring is done. Henrik Bengtsson > 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 > > ______________________________________________ [EMAIL PROTECTED] mailing list http://www.stat.math.ethz.ch/mailman/listinfo/r-help
