[R] persp plot increasing 'x' and 'y' values expected

[Michael Dondrup]

Hmm,

well, of course this is tested, and it produces a plot, but not the correct 
one ;) Sorry, that was too quick.... 


Am Tuesday 25 April 2006 12:51 schrieb Duncan Murdoch:
> 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 voodooochild at gmx.de:
> >> 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$z),length(y),length(x))
> >>
> >> it also doesn't work.
> >>
> >> i want to do a plot, where i can see, how x and y influences z.
> >>
> >> P Ehlers wrote:
> >>> voodooochild at gmx.de wrote:
> >>>> hello,
> >>>>
> >>>> i do the following in order to get an persp-plot
> >>>>
> >>>> x<-c(2,2,2,2,2,2,3,3,3,3)
> >>>> y<-c(41,41,83,83,124,166,208,208,208,208)
> >>>> z<-c(90366,90366,92240,92240,92240,96473,100995,100995,100995,100995)
> >>>> x<-data$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
> >>
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