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

[voodooochild at gmx.de]

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?

best regards
andreas