解释R中format()的这种行为

Question

> format(1111111, digits=10, nsmall=2, decimal.mark=".", big.mark=",")
[1] "1,111,111.00"

。然而:

> format(1000000, digits=10, nsmall=2, decimal.mark=".", big.mark=",")
[1] "1e+06"

期望:10,000,000.00。我查了?format，没有明显的

Answer 1

设置scientific参数:

format(1000000, digits=10, nsmall=2, decimal.mark=".", 
       big.mark=",",scientific=FALSE)
[1] "1,000,000.00"