评论会减慢 R 的速度吗？

Question

cmets 减速了吗R？

这个问题已经在 StackOverflow 上被问过两次关于 python 的问题：

Do comments slow down an interpreted language? Will excessive commenting of code slow execution?

对于python，答案似乎是否定的。我对这两种语言之间的差异了解不多，无法知道这些答案与R 的相关性。

这是关于R 中空白的类似问题。答案似乎又是“不”。

does white space slow down processing

Answer 1

对于 R，答案似乎是“是”，除非我在下面某处犯了错误。

# Time difference of 21.84725 secs
# Time difference of 24.05738 secs

# total.time.2 - total.time.1
#
# Time difference of 2.210126 secs

n <- 280

start.time.1 <- Sys.time()

b <- 2

for(i in 1:n) {
     for(j in 1:n) {
          for(k in 1:n) {

               b <- b + 2 - 1 - 0.75

          }
     }
}

b

end.time.1 <- Sys.time()

total.time.1 <- end.time.1 - start.time.1
total.time.1


start.time.2 <- Sys.time()

b <- 2

# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.


for(i in 1:n) {

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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.

     for(j in 1:n) {

# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
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# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.

          for(k in 1:n) {

# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.

               b <- b + 2 - 1 - 0.75

# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.
# I wonder whether comments slow down R.  Here are some comments.  Let's see.

          }
     }
}

b

end.time.2 <- Sys.time()

total.time.2 <- end.time.2 - start.time.2

total.time.1
total.time.2

total.time.2 - total.time.1