我想知道:
之间是否有任何区别library("microbenchmark")
library("zoo")
N <- 10000
x <- 1:N
microbenchmark(
math=c(1-2*N, rep(1, N-2), N*N-(N-1)), # for the data from the question
vect.i=x*x - c(x[N], x[-N])*c(x[-1], x[1]), # general data
roll.i=rollapply(c(x[length(x)],x, x[1]), width=3, function(x) x[2]^2 - x[1]*x[3]), # or:
roll.tail=rollapply(c(tail(x,1), x, x[1]), width=3, function(x) x[2]^2 - x[1]*x[3])
)
# Unit: microseconds
# expr min lq mean median uq max neval cld
# math 33.613 34.4950 76.18809 36.9130 38.0355 2002.152 100 a
# vect.i 188.928 192.5315 732.50725 197.1955 198.5245 51649.652 100 a
# roll.i 56748.920 62217.2550 67666.66315 68195.5085 71214.9785 109195.049 100 b
# roll.tail 57661.835 63855.7060 68815.91001 67315.5425 71339.6045 119428.718 100 b
和
import maya.cmds as cmds
cmds.polyCube()
答案 0 :(得分:1)
在目前的情况下,import maya.cmds as cmds
和from maya import cmds
之间没有区别。请查看this 8-year-old post以了解可能的利弊。
希望这有帮助!