What ways are there to edit a function in R?

by

There is a body<- function that lets you assign new content of the function.

body(foo)[[3]] <- substitute(line2 <- 2)
foo
#-----------    
function (x) 
{
    line1 <- x
    line2 <- 2
    line3 <- line1 + line2
    return(line3)
}

(The “{” is body(foo)[[1]] and each line is a successive element of the list. Therefore the second line is the third element in the expression list. The inserted elements need to be unevaluated expressions rather than text.)

There is also a corresponding formals<- function that lets one perform similar surgery on the argument pairlist.

Note: fixInNamespace is probably a better choice than fix if the function will be calling accessory functional resources in a loaded package. When used from the console, both fix will assign results to the .GlobalEnv.

More Related Contents:

  1. Create a function within a function [closed]
  2. how to apply a function on a data set?
  3. Error: could not find function … in R
  4. How can I view the source code for a function?
  5. How to use R’s ellipsis feature when writing your own function?
  6. data.table objects assigned with := from within function not printed
  7. Update data frame via function doesn’t work
  8. Returning multiple objects in an R function [duplicate]
  9. How to create an R function programmatically?
  10. dplyr: “Error in n(): function should not be called directly”
  11. converting multiple columns from character to numeric format in r
  12. Function to calculate R2 (R-squared) in R
  13. Reading multiple files and calculating mean based on user input
  14. Finding out which functions are called within a given function [duplicate]
  15. R function with no return value
  16. How do I override a non-visible function in the package namespace?
  17. What is the meaning of the dollar sign “$” in R function()?
  18. How to compare functions?
  19. Return a data frame from function
  20. R: Obtaining Rules from a Function
  21. Object not found error with ddply inside a function
  22. “Correct” way to specifiy optional arguments in R functions
  23. R: x ‘probs’ outside [0,1]
  24. R function not returning values
  25. Using get() with replacement functions
  26. Getting a function name as a string
  27. Run a custom function on a data frame in R, by group
  28. R specify function environment
  29. How to pass aes parameters of ggplot to function
  30. How to use data.table within functions and loops?

Leave a Comment