R help - Mar 2013 - how to construct bivariate joint cumulative pdf from bivariate joint pdf

Hello,

I am using sm.density() to find the bivariate joint PDFof events:

For eg,
x<-cbind(rnorm(30),rnorm(30))
den<-sm.density(x)

Then I get the joint pdf from den$estimate in order to constructthe 
joint cumulative PDF.
However, summing up all the values from den$estimateisnot equal to 
1(have multipliedby the grid size).

Anyone could help?

Thanks.
mc



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