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2004 May 05
4
Discontinuities in a simple graph (machine precision?)
...o quickly produce a graph of this over the range [-3,3] so I
used:
plotit <-function(x=seq(-3,3,0.01),...){
y<-sapply(x,mdevstdev)
plot(x,y,...)
}
> plotit()
This produces the graph, but some discontinuities appear on it. I've
produced the same graph in Mathematica 5
(http://econserv2.bess.tcd.ie/cullens/R/DOverDelta.eps), and it was smooth
over this range (it takes ages to run, though). Is this a numerical
precision problem? Any suggestions on how to improve the precision?
I'm running R 1.9 on WinXP, PIII. I haven't changed any R parameters that
I know of.
--
S...