Efficient way to modify a data frame in r
132210
How to assign a counter to a specific subset of a data.frame which is defined by a factor combination?
140331
For loop in R assigning to a data frame
33391
Select rows in a dataframe in r based on values in one row
31119
Count number of rows per group and add result to original data frame
49862
Aligning Data frame with missing values
137286
stacking columns in data.frame into one column in R
49286
modify specific column with sed or awk
31519
R: subsetting data frame by both certain column names (as a variable) and field values
141208
subset a data.frame with multiple conditions
90575
How do I replace NA values with zeros in an R dataframe?
146977
Subset of a data frame with the penultimate values of one of the columns
155361
Split data.frame by value
39134
Subset data frame based on number of rows per group
43575
R cleaning up a character and converting it into a numeric
79594
Convert factor to integer in a data frame
152949
Reshape multiple value columns to wide format
103905
Expand grid with unknown dimension in R