How to Get the Function Code in R
http://fhqdddddd.blog.163.com/blog/static/1869915420104111031148/
http://blog.sina.com.cn/s/blog_61f013b80100gekp.html
http://rbbs.biosino.org/Rbbs/posts/list/1073.page
How to Get the Function Code in R
R is “open-access”, so I can read and modify the function code for further application. And that is the reason I choose it, use it and love it.
But first, let’s explore how to get the function code.
1. On R Console. function_name + Enter. For example:
> fivenum
function (x, na.rm = TRUE)
{
xna <- is.na(x)
if (na.rm)
x <- x[!xna]
else if (any(xna))
return(rep.int(NA, 5))
x <- sort(x)
n <- length(x)
if (n == 0)
rep.int(NA, 5)
else {
n4 <- floor((n + 3)/2)/2
d <- c(1, n4, (n + 1)/2, n + 1 - n4, n)
0.5 * (x[floor(d)] + x[ceiling(d)])
}
}
<environment: namespace:stats>
2. function_name.default. For example:
>qqnorm.default
# this is a visible function, a special case of 3 later.
3. For generic functions like “rep”
>t.test
function (x, ...)
UseMethod("t.test")
<environment: namespace:stats>
>methods(“t.test”)
[1] t.test.default* t.test.formula*
Non-visible functions are asterisked
# first, we should known the “methods” used.
>getAnywhere(“t.test.default”) or >stats:::t.test.default or >getS3method(“t.test”,“default”)
# get “t.test.default” code
4. If all the methods discussed above cannot help, just open the R-code(.tar.gz) for the Z-plan.
For more:
http://rbbs.biosino.org/Rbbs/posts/list/63.page#574#574
http://www.pinggu.org/bbs/b69i336419.html
http://cos.name/bbs/read.php?tid=1065
http://tel.pinggu.org/bbs/b69i456670p4.html
In addition, thanks for Dr. Ding’s prompt help and discussion about the “wilcox.test” function code in R.
