Rdebug

fixInNamespace 对名为 x 的对象调用 edit 并指定修改后的对象代替原始对象。

getFromNameSpace搭配edit可以修改过软件的内置函数

Trace

trace(recover, sink)

trace(print, quote(if (is.numeric(x) && x >= 3) cat("hi\n")), print = FALSE)

## Tracing function "print" in package "base"

## [1] "print"

print(1)

## [1] 1

Chapter 11 Debugging R code | What They Forgot to Teach You About R (rstats.wtf)

print(3)

## hi
## [1] 3

# Use untrace to remove the tracing code
untrace(print)