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

voodooochild at gmx.de voodooochild at gmx.de
Tue Apr 25 12:24:25 CEST 2006

hi peter,

thank you for your advice.
ok, i see the problem, but if i do


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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