On 4/25/2006 6:23 AM, Michael Dondrup wrote: > Hi, > of course it can't because the number of unique values is different. You need > a unique _combination_ of x,y and hopefully you don't have different z values > for any such a pair. try: > > xyz <- unique(cbind(x,y,z)) > persp(xyz) > > If you still get the err, then you had different measurements for the same > point.
I think you and Andreas want scatterplot3d (from a contributed package of the same name), not persp. Persp takes very data in a very particular format. See the man page. In general, it's a good idea to test your suggestions before posting them. Yours wouldn't work, because x, y and z *must not* be the same length in persp. Duncan Murdoch > > Am Tuesday 25 April 2006 12:24 schrieb [EMAIL PROTECTED]: >> hi peter, >> >> thank you for your advice. >> ok, i see the problem, but if i do >> >> x<-unique(data$x) >> y<-unique(data$y) >> z<-matrix(unique(data$z),length(y),length(x)) >> >> it also doesn't work. >> >> i want to do a plot, where i can see, how x and y influences z. >> >> P Ehlers wrote: >>> [EMAIL PROTECTED] wrote: >>>> hello, >>>> >>>> i do the following in order to get an persp-plot >>>> >>>> x<-c(2,2,2,2,2,2,3,3,3,3) >>>> y<-c(41,41,83,83,124,166,208,208,208,208) >>>> z<-c(90366,90366,92240,92240,92240,96473,100995,100995,100995,100995) >>>> x<-data$x >>>> y<-data$y >>>> z<-matrix(data$z,length(y),length(x)) >>>> persp(x,y,z, col="gray") >>>> >>>> but i always get the error message increasing 'x' and 'y' values >>>> expected, but i think my data values are already increasing, what is >>>> wrong? >>> I'm not sure what your data$x, data$y, data$z are (but I can guess). >>> Why do you think that your x is *increasing*? Is x[i+1] > x[i]? >>> Does diff(x) yield only positive values? >>> >>> What kind of a perspective plot do you expect? You seem to have only >>> 5 unique points. >>> >>> Peter Ehlers >>> >>>> best regards >>>> andreas >> ______________________________________________ >> R-help@stat.math.ethz.ch mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! >> http://www.R-project.org/posting-guide.html > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
