r-faq Archives - Page 6 of 7

How to unload a package without restarting R

I’d like to unload a package without having to restart R (mostly because restarting R as I try out different, conflicting packages is ...

April 29, 2022
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What is the difference between require() and library()?

What is the difference between require() and library()? 8 s 8 In addition to the good advice already given, I would add this: ...

April 29, 2022
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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 ...

April 29, 2022
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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: package 'foobarbaz' is not available (for R version x.y.z) ...

April 28, 2022
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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, ...

April 28, 2022
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How to convert a factor to integer\numeric 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. f <- ...

April 28, 2022
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What are the differences between “=” and “

What are the differences between the assignment operators = and <- in R? I know that operators are slightly different, as this example ...

April 19, 2022
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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 ...

April 16, 2022
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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 example data frame. ...

April 16, 2022
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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, I’ve never ...

April 14, 2022
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