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

P Ehlers ehlers at math.ucalgary.ca
Tue Apr 25 12:17:02 CEST 2006

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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