Add a new column between other dataframe columns
45771
Add (insert) a column between two columns in a data.frame
88600
Add timestamp to two different columns in Google Spreadsheets
43180
Extract data from a file and place in different files based on one column value
29248
How to merge columns in a table?
90847
Split column at delimiter in data frame
37373
Reshape three column data frame to matrix ("long" to "wide" format)
102426
How Do I Combine Columns In Google Spreadsheets?
94756
Join two files, adding values in certain columns
24228
How to add a factor column to dataframe based on a conditional statement from another column?
17323
Selecting most recent date between two columns
78854
Merging columns from two separate files
57008
How can I fill a unitary knowing only its first column?
100133
Sum up rows from different data files
12103
How to copy values from one column to another
4905
Merging two files, one column at a time
65139
How to select all columns, except one column in pandas?
149518
Adding counts of a factor to a dataframe