How can I concatenate (merge, combine) two values? For example I have: tmp = cbind("GAD", "AB") tmp # [,1] [,2] #...
I have a data frame with two columns. First column contains categories such as “First”, “Second”, “Third”, and the second column has numbers ...
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May 5, 2022
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I want to write trycatch code to deal with error in downloading from the web. url <- c( "http://stat.ethz.ch/R-manual/R-devel/library/base/html/connections.html", "http://en.wikipedia.org/wiki/Xz") y <- mapply(readLines, ...
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May 5, 2022
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I have a vector of numbers: numbers <- c(4,23,4,23,5,43,54,56,657,67,67,435, 453,435,324,34,456,56,567,65,34,435) How can I have R count the number of times a value x ...
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May 5, 2022
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In R, mean() and median() are standard functions which do what you’d expect. mode() tells you the internal storage mode of the object, ...
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May 5, 2022
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I have very large tables (30 million rows) that I would like to load as a dataframes in R. read.table() has a lot ...
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May 1, 2022
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I have a data frame containing a factor. When I create a subset of this dataframe using subset or another indexing function, a ...
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April 30, 2022
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How to check if a vector contains a given value? 7 s 7
R provides two different methods for accessing the elements of a list or data.frame: and [. What is the difference between the ...
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April 29, 2022
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