Searching a functions source code
In R, you can view the source of a function as a function is simply another object.
I am looking for a way to search through this source code, without knowing the file that the source is saved in.
For example, I might want to know if the function shapiro.test contains the function sort (it does).
If shapiro.test was a string or a vector of strings I would use
grep('sort', shapiro.test)
But as shapiro.test is a function, this gives the error "Error in as.character(x) : cannot coerce type 'closure' to vector of type 'character'".
I've had no luck trying to coerce the function to a string. Just as an extra, I'm not expecting to be able to search through base functions as they are compiled.
这里使用deparse解决方案：
> grep ("sort", deparse(shapiro.test))
[1] 5
You could wrap the function in capture.output , which will convert each line to an element in a character vector.
> grep("sort",capture.output(shapiro.test))
[1] 5
Or you could just call edit(shapiro.test) and use the text editor specified by options(editor=) to search through the function.
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