Mario Alberto Cozzuol wrote: > > On Saturday 20 September 2003 12:18, Uwe Ligges wrote: > > So you are not going to plot a surface, but "just" a set of points? In > > that case persp() is inadequate. For example you can use cloud() in > > package lattice, scatterplot3d() in package "scatterplot3d", the > > packages djmrgl and rgl, or xgobi or ggobi as external software. > > Actually I want to plot a surface, a geographic surface just like the volcano > in the example, this is because does not make sense to order x and y. In my > case the z values are the pH value for the soil at each poit. > I am missing something?
My guess was wrong. But your question can be easily be answered by reading ?persp: "x, y: locations of grid lines at which the values in `z' are measured." So you need a vector x of length n, a vector y of length m and a matrix z of dimension n x m. You do NOT need a value of x and y for each point, but only for each grid line. There is not difficulty to order them, when you already got a matrix for z. Uwe > Thanks, > > Mario > > -- > Dr. Mario A. Cozzuol > Laborat�rio de Biologia Evolutiva > Universidade Federal de Rond�nia > BR 364, Km 9,5 > 78900-000 Porto Velho, RO > Brasil > Tel./Fax 55 69 217-8593 > E-mail [EMAIL PROTECTED] > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
