R Archives - Page 12 of 18

ISO week number and ISO year in R

The easiest way to do ISO week number and ISO year calculations in R is by using two simple functions from package lubridate.

Variance or other calculation across columns in R

Here is how to calculate variance across columns in the R data frame. The same technique can be useful in other situations. Like in this other example. Get a count of NA values for each of the columns in the R data frame.

Group index that restarts in R

Here is how to generate a group index in R that restarts every time there change in variables.

Running, moving, rolling average in R, dplyr

You can calculate the moving average (also called a running or rolling average) in different ways by using R packages.

Combine apply and match in R, return the name of the column

Here is how to use functions apply and match together in R and a result – return the name of the column that contains minimum or maximum.

Edit R data frame almost like in Excel

Do you want to edit R data frame like an Excel table? It is not possible the same way. But on the other hand, there is a solution that is comfortable enough to edit a few entries.

R “not in” operator, opposite of “in”

R operator %in% is handy for working with vectors, but how to use it oppositely? Something like %notin% that will exclude anything that is in a vector.