Hi list! I have a data frame called fix and a list of index vectors called rois:
> head(rois, 3) [[1]] [1] 2 1 [[2]] [1] 3 [[3]] [1] 6 7 28 26 27 24 25 The part that's causing the issue is the following line: lapply(rois, function(roi) fix$x[roi] <- 100) So for every index vector I'd like to set the respective entries in the data frame (fix) to 100. I expected the data frame would be changed after lapply but instead it remains unchanged. I understand that when I pass an argument into a function it gets passed as a value and not as a reference. But here fix is not an argument but captured in the closure. Do my questions are: What's going on here and what is the idiomatic way of achieving my goal? Thanks for any help! Titus ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
