A few examples of the string helper functions and a comparison to substr
and other R base functions.
First of all, we want the package loaded and attached. Same for the benchmarks.
library(Wmisc)
A string from (http://slipsum.com/).
s <- "You think water moves fast? You should see ice. It moves like it has a mind. Like it knows it killed the world once and got a taste for murder. After the avalanche, it took us a week to climb out. Now, I don't know exactly when we turned on each other, but I know that seven of us survived the slide... and only five made it out. Now we took an oath, that I'm breaking now. We said we'd say it was the snow that killed the other two, but it wasn't. Nature is lethal but it doesn't hold a candle to man."
strHead(s) strHeadLower(s) strTail(s)
substr(s,1,1) tolower(substr(s,1,1)) substring(s,2)
The benchmark results will vary greatly depending on the version of R used. With R 3.3 (upwards) the built-in functions should be preferred.
if (requireNamespace("DiagrammeR", quietly = TRUE)) { # only benchmark if microbenchmark is installed library(microbenchmark) microbenchmark(substr(s,1,1),strHead(s),times=100000) microbenchmark(tolower(substr(s,1,1)),strHeadLower(s),times=100000) microbenchmark(substring(s,2),strTail(s),times=100000) } else { print("The benchmarks were skipped as package microbenchmark is not installed.") }
substr(s,1,42) strTake(s,42)
substring(s,43) strDrop(s,42)
if (requireNamespace("DiagrammeR", quietly = TRUE)) { # only benchmark if microbenchmark is installed microbenchmark(substr(s,1,42),strTake(s,42),times=100000) microbenchmark(substring(s,43),strDrop(s,42),times=100000) }
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.