1/6/2023 0 Comments Clear command in rYou can also insert a call to gc() within a loop to repeatedly run the garbage collection process. Therefore, as the gc documentation notes, it is a good idea to call gc() after a large object has been removed since this action prompts R to release the memory it no longer uses. As a side effect, calling gc() triggers the garbage collection process, clearing memory. The main purpose of gc() is to show a report about memory usage. In such a situation, it could be useful to call the gc() function to clear the memory in R. The garbage collection process runs automatically and periodically within R, but sometimes it doesn’t run at the precise moment when you need a lot of memory for some big data operation. The problem is those memory chunks are not immediately freed-up for use by new tasks. The command rm(list=ls()) is expected to release the memory used by all objects, but what it really does is to destroy the pointers to the used memory chunks. Even if you restart your R environment, it can happen that the memory isn’t freed-up. This situation may end up with the R system refusing to run code because it can’t allocate any more memory. After working with R scripts for a while, the R environment may hoard a lot of in-memory data, withholding significant parts of the computer’s resources.
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