How to clean up R memory (without the need to restart my PC)?

Question

I am running my code in R (under Windows) which involves a lot of in-memory data. I tried to use rm(list=ls()) to clean up memory, but seems the memory is still

Answer 1

Use ls() function to see what R objects are occupying space. use rm("objectName") to clear the objects from R memory that is no longer required. See this too.