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...id not see any NEWS item suggesting this change is expected. Note that the example is contrived and I don't have a use case for it. I stumbled across it when playing with recent changes in R relating to duplication. Does the example use undefined syntax? ----- fn1 <- function(mylist) { fn1a <- function() mylist[[c(1,1)]][[1]] <<- 9 fn1a() return(NULL) } fn2 <- function(myarg) fn1(myarg) test_list <- list(list(list(1))) print(test_list[[c(1,1,1)]]) fn2(test_list) print(test_list[[c(1,1,1)]]) ----- Before r64970 the output is [1] 1 [1] 1 After r64970 the outpu...

Hi R-users, Does R has a topic on newton's method? Thank you for the info.