On 27/07/2010 6:34 PM, vincent.deluard wrote:
Hi all,
I am dealing with very large numbers but I am only interested in their last
digits.
244^244
[1] Inf
As far as I can tell, the largest number R can take has 308 digits (1+E308).
Is there a way I could see the last digits only of 244^244?
Many thanks for your help.
Vincent Deluard, CFA.
Use the facts that the last digits of X are equal to X modulo 10^n, for
some n, and that X*Y modulo Z = (X modulo Z) * (Y modulo Z) modulo Z.
Then you can calculate it easily in base R, as long as n is no more than
7 (so that the individual multiplications don't overflow). For example,
> result <- 1
> for ( i in 1:244)
+ result <- (result * 244) %% 1000
> result
[1] 496
Duncan Murdoch
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