如何以微秒计算system.time？

Question

有没有办法改变system.time的精度？

system.time(sum(seq(1.0,10^4,1)))

类似于：

round(system.time(sum(seq(1.0,10^4,1))),digits=6)

Answer 1

您应该使用包microbenchmark来实现此目的。

从包DESCRIPTION：

Package:            microbenchmark
Title:              Sub microsecond accurate timing functions.
Description:        Provides infrastructure to accurately measure and compare the execution time of R expressions.