非常大与小值的乘法 [英] multiplication of very large with small values

问题描述

作为大二项式系数的结果，我总结抱歉地存储了一个数字作为大整数（来自gmp）包

  Big Integer（'bigz'）：
 [1]>选择Z（1599,999）
  

大整数（'bigz'）：
[1] 64702725976477841685087011694882593433664461459998756503370133423490886710992479387020713114439119078572270410565905096678530812549132718109065352925330156276352159906752920126061592461003982967533637590930195693832792290806000097619179060714793020167850667221328682056807933391950779186595385360309444776548462757363488307499961774581415255778468273486215727708155489945082243963752226921889401251140938597561863975549109487674702867681182063412410767713200

现在我需要与

  [1乘以它] 1.884357e-08 
  

如果我转换成大整数，我得到的数字是1.88 e-8只是四舍五入为0，这意味着乘法是0.我怎样才能在R中乘以两个数字？解决方案尝试使用大理性代替：

 巨大<  -  as.bigq（yourcoef，d = 1）
 tiny<  -  as.bi gq（yoursmall，d = 1）
 mul.bigq（huge，tiny）
  

as the result of a large binomial coefficient I summed sorry stored a number as big integer (from the gmp) package

Big Integer ('bigz') :
[1] > chooseZ(1599,999)

Big Integer ('bigz') : [1] 64702725976477841685087011694882593433664461459998756503370133423490886710992479387020713114439119078572270410565905096678530812549132718109065352925330156276352159906752920126061592461003982967533637590930195693832792290806000097619179060714793020167850667221328682056807933391950779186595385360309444776548462757363488307499961774581415255778468273486215727708155489945082243963752226921889401251140938597561863975549109487674702867681182063412410767713200

now I would need to multiply it with

[1] 1.884357e-08

if I convert into big integer I get that the number 1.88 e-8 is just rounded to 0 which means the multiplication is 0. How can I multiply both numbers in R

解决方案

Try use big rational instead:

huge <- as.bigq(yourcoef,d=1)
tiny <- as.bigq(yoursmall,d=1)
mul.bigq(huge,tiny)

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