Created
May 13, 2012 20:40
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Monitor a variable in R
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| ## Credit Hadley Wickham | |
| ## http://www.mail-archive.com/r-help@r-project.org/msg125980.html | |
| watch <- function(varname) { | |
| old <- get(varname) | |
| changed <- function(...) { | |
| new <- get(varname) | |
| if (!identical(old, new)) { | |
| message(varname, " is now ", new) | |
| old <<- new | |
| } | |
| TRUE | |
| } | |
| invisible(addTaskCallback(changed)) | |
| } | |
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| > a <- 1 | |
| > watch("a") | |
| > a <- 2 | |
| a is now 2 |
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