How to pivot_longer a set of multiple columns? and How to go back from that long format to original ...

How can I save files in parallel without automatically increasing the file size?...

take a part from a string without a specific pattern...

Is there a R function that applies a function to each pair of columns?...

Column in the j-expression of a data.table (with/without a by statement)...

How can I make a data frame of the unique values in an existing column?...

Replacement of plyr::cbind.fill in dplyr?...

Aggregate and collapse a vector based while maintaing order...

Manipulating a matrix with conditions and concatenating the results...

Adding a new string column to a dataframe based on a previous numeric column in R...

Compute rolling sum by id variables, with missing timepoints...

Iterating over multiple lists using purrr::map...

dplyr: "Error in n(): function should not be called directly"...

How often observations occur together in rows R...

Look back column based on date and rank in R...

Increment indicator column in R...

Getting at the previous n-rows in a data frame?...

Conditional NA filling by group...

Adding and subtracting values from columns in dataframe...

Using dplyr's rename() including variable names not in data set...

Use ifelse and is.null to test for NULL values...

Imputing NA with conditional LOCF...

Block bootstrap from subject list...

creating distinct values column till certain time...

Creating a new variable based on prior history...

Having trouble using the 'gather' function in tidyr...

Convert plyr::ddply to dplyr...

How to keep data frame format when applying sapply in R?...

Is there a dplyr or data.table equivalent to plyr::join_all? Joining by a list of data frames?...

How to create multiple line chart in r...