[R] Increase Decimal Accuracy?

Ann Hess hess at stat.colostate.edu
Thu Mar 2 23:36:40 CET 2006

Is there any way to increase the decimal accuracy for probability 
distributions.  For example (in R):

> 1-pchisq(90,5)
[1] 0

But in Maple, I find that the value is 0.67193x10-17.

I need to compare some really small p-values...is there a way to increase 
the decimal place accuracy beyond 1x10-16 (which seems to be the limit)?

Any help would be appreciated.


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