Jorgen Harmse
2023-Sep-20 14:13 UTC
[R] Could you manually replicate execution of a R function
There may be collisions between variables in .GlobalEnv and variables in the function-call environment, and the parent of the function-call environment probably includes functions & other variables not available in .GlobalEnv. (If the function calls substitute or anything like that then the problem becomes even harder.) I would probably use the debugger to step into the function. If you want more control then create an environment that resembles what would be created in a function call: env.func <- new.env(parent=environment(f)) delayedAssign(assign.env=env.func, ?.) for everything you pass in delayedAssign(assign.env=env.func, eval.env=env.func, ?.) for anything that will take a default value eval(envir=env.func, ?.) or evalq(envir=env.func, ?.) to execute parts of the function body or anything else You can even coerce body(f) to a character, strip the leading ?{?, and parse(text=?.) to break the function into expressions. That might be easier than copy-pasting function code. Regards, Jorgen Harmse. Message: 1 Date: Tue, 19 Sep 2023 23:09:18 +0530 From: Brian Smith <briansmith199312 at gmail.com> To: r-help at r-project.org Subject: [R] Could you manually replicate execution of a R function Message-ID: <CAHUBDY_wr_uWTK3t2bU+EmVGvKRNHw4DdvmqMq+F0rq6R3OxGw at mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi, I have trying to replicate a function from rugarch package manually. Below is the calculation based on the function, ? [[alternative HTML version deleted]]