53
votes
18
answers
825
views
How should I deal with "package 'xxx' is not available (for R version x.y.z)" warning?
I tried to install a package, using install.packages("foobarbaz") but received the warning Warning message
44
votes
11
answers
1K
views
How can I view the source code for a function?
I want to look at the source code for a function to see how it works. I know I can print a function by typing
57
votes
16
answers
2.3K
views
Plot two graphs in same plot in R
I would like to plot y1 and y2 in the same plot. x <- seq(-2, 2, 0.05) y1 <- pnorm(x) y2 <- pnorm(x
61
votes
11
answers
1.1K
views
How to convert a factor to integer umeric without loss of information?
When I convert a factor to a numeric or integer, I get the underlying level codes, not the values as numbers.
53
votes
8
answers
503
views
What are the differences between "=" and "<-" assignment operators in R?
What are the differences between the assignment operators = and <- in R? I know that operators are slight
60
votes
17
answers
1.7K
views
Remove rows with all or some NAs (missing values) in data.frame
I'd like to remove the lines in this data frame that: a) contain NAs across all columns. Below is my exa
58
votes
21
answers
1.6K
views
Drop data frame columns by name
I have a number of columns that I would like to remove from a data frame. I know that we can delete them indiv
59
votes
10
answers
638
views
Grouping functions (tapply, by, aggregate) and the *apply family
Whenever I want to do something "map"py in R, I usually try to use a function in the apply family. However,
54
votes
13
answers
2.9K
views
How to join (merge) data frames (inner, outer, left, right)
Given two data frames: df1 = data.frame(CustomerId = c(1:6), Product = c(rep("Toaster", 3), rep("Radio", 3)))
64
votes
19
answers
698
views
How to sort a dataframe by multiple column(s)
I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort b
52
votes
23
answers
2K
views
