Displaying 1 result from an estimated 1 matches for "tp3690576p3690818".
2011 Jul 24
2
split data frame temporary and work with only part of it?
dear R wizards: I have a large data frame, a million rows, 40
columns. In this data frame, there are some (about 100,000) rows
which I want to recompute (update), while I want to leave others just
as is. this is based on a condition that I need to compute, based on
what is in a few of the columns. what is the right R way to do this?
I could subset out the rows that I want to recompute into a