[R] persp(), x- and y-axis with character strings

[Pfaff, Bernhard]

Dear R list,

I want to plot the yield curve in a 3D graph: the x-axis refers to time; the
y-axis refers to the maturities and the z-axis are the yields.

The following code works fine:

persp(y, x, as.matrix(ypper), xlab="Last 50 periods", ylab="Maturities
(months)",zlab="Yields", 
zlim=c(3,6),theta=130, phi=15, col="Seagreen", box=T, ticktype="detailed",
shade=0.3, 
ltheta=270, lphi=30, r=sqrt(3), expand=.75, main="Historical yield curves")

Now, I want to replace the x- and y-axis with character strings, such that:

temp<-seq(ISOdate(1999,1,1), by="week", length=(nrow(yall)))
temp.ymd <-
substr(as.character(temp),1,10)[(lastobs-index[length(index)]):lastobs]

the object 'temp.ymd' is presented on the x-axis and 

colnames(ypper) 

(another character string) is presented on the y-axis.

I know that one can supress the axes in persp(), but then I am struck by
adding them with axis() handish.

Any help?
Rgds
Bernhard 


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