On 3/4/06, Jan Marius Hofert <[EMAIL PROTECTED]> wrote: > Hi, > > I would like to plot a wireframe (library: lattice) of the function f > (x,y)=x*y where x and y are equally evaluated between 0 and 1. > When one uses the option drape=TRUE then each "square" between the > "wires" (lines that build the surface shape) gets a certain color. A > perfect wireframe plot of a continuous surface would be, if you > (almost) can not distinguish between the colors of those "squares" > that lie adjacent to each other. So the idea would be, to choose many > many evaluation points for x (and y), say x (and y) consists of 1000 > equally spaced intermediate points. But the problem is, that there > are too many "wires" plotted... the whole picture is dark... On the > other hand, if you use only 20 points for the x (and also y) axis, > then you get a really nice wired frame, but the colors for each > "square" differ a lot (if you do not think that they differ a lot > then just think of plotting a different function and this "color- > problem" appears again). So the solution would be, to choose many > many values for x (and y) _but_ only to plot wires -say- every 10th > time, the color changes, i.e. not to plot _all_ wires but only a > subset (every 10th wire for example). Is that possible?? How??
It is certainly possible, by making appropriate changes in 'panel.3dwire' (and wherever else that leads). I don't think it would be trivial, but R and lattice are Free Software, so you are welcome to try. You might alternatively consider using 'shade=TRUE', which allows encoding of both height and orientation by color (rather than 'drape' which encodes height by color and orientation by the `wires'). Deepayan -- http://www.stat.wisc.edu/~deepayan/ ______________________________________________ [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
