Assign group-level indices during or after melt
92954
How do I use plyr to number rows?
2060
How do I create group data in a category with more than and less than in R?
70769
How do I copy vertex groups from one object to another?
111057
On the position of multiple sub and superindices
82787
Multirow axis labels with nested grouping variables
123566
Recoding a variable with three levels into a dummy variable
133468
Assign zeros to large list of indexed variables
12350
How do you put conditions on indices in a sum?
113841
How can I change my node group interface to more easily edit the Group Input/Output nodes?
116765
Bug in grouping after editing code?
13153
at least one element fixed by all the group
52488
Manually setting group colors for ggplot2
81170
How to replace NA with mean by group / subset?
33206
Derivation of Mode of grouped data
140271
Assigning identical array indices at once in Python/Numpy
154512
Group nodes by terms
5136
How to sum a variable by group