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140
How can I drop unused levels from a data frame?
stackoverflow.com

94
Extract row corresponding to minimum value of a variable by group
stackoverflow.com

85
Add empty columns to a dataframe with specified names from a vector
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53
Find elements in a character array that contains a string
stackoverflow.com

46
Freefall into snow
physics.stackexchange.com

45
Since the speed of light is constant and also the speed limit; would you, in your reference frame, have no upper bound on your speed?
physics.stackexchange.com

45
Aggregate all columns of data.table, without having to reference them by name
stackoverflow.com

30
Why doesn't the voltage increase when batteries are connected in parallel?
physics.stackexchange.com

27
Acceleration without force in rotational motion?
physics.stackexchange.com

26
Cartesian join in data.table
stackoverflow.com

23
closing unused RODBC handle
stackoverflow.com

22
Select column 2 to last column in R
stackoverflow.com

21
How to calculate wind direction from U and V wind components in R
stackoverflow.com

19
for loop object names iterate
stackoverflow.com

19
How to create an empty matrix in R?
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18
Meaning of %o% in R
stackoverflow.com

17
Would computers accelerated to high speeds compute "faster" from our point of view?
physics.stackexchange.com

15
What is the connection between special and general relativity?
physics.stackexchange.com

15
How to aggregate (using "by") a data.table with customized column name without ":="?
stackoverflow.com

15
How do I run a function every second
stackoverflow.com

14
Indirectly breaking the speed of light
physics.stackexchange.com

14
What determines the top speed in ice skating?
physics.stackexchange.com

13
Referencing Row Number in R
stackoverflow.com

13
Change TRUE and FALSE to Yes and No
stackoverflow.com

13
Single bar barchart in ggplot2, R
stackoverflow.com

13
R divide each column in dataframe by last row value
stackoverflow.com

12
Tension in a simple pendulum
physics.stackexchange.com

12
Storing results of loop iterations in R
stackoverflow.com

11
Why is transform.data.table so much slower than transform.data.frame?
stackoverflow.com

11
Make a list from ls(pattern="") [R]
stackoverflow.com

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