r - How to add row index to a data frame, based on combination of factors
13177
Numbering rows within groups in a data frame
100214
Group by multiple columns in dplyr, using string vector input
147397
How do I combine two data-frames based on two columns?
6493
Repeat each row of data.frame the number of times specified in a column
131572
Converting list of raster to a data frame using R?
3455
unique combinations of values in selected columns in pandas data frame and count
49862
Aligning Data frame with missing values
9668
Consecutive/Rolling sums in a vector in R
127774
Taking product of cofactor with different row
67150
Index with exercise numbers
79397
How to do a generalized linear model with multiple dependent variables in R?
76830
How can correlate against multiple columns using ddply?
39134
Subset data frame based on number of rows per group
7354
How to convert a factor to integer\numeric without loss of information?
19650
Idiomatic R code for partitioning a vector by an index and performing an operation on that partition
133825
Reorder levels of a factor without changing order of values
146682
How to calculate the index (lexicographical order) when the combination is given