r Archives - Page 15 of 17

Changing column names of a data frame

I have a data frame called “newprice” (see below) and I want to change the column names in my program in R. > ...

May 5, 2022
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Counting the number of elements with the values of x in a vector

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 ...

May 5, 2022
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How to find the statistical mode?

In R, mean() and median() are standard functions which do what you’d expect. mode() tells you the internal storage mode of the object, ...

May 5, 2022
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Check existence of directory and create if doesn’t exist

I often find myself writing R scripts that generate a lot of output. I find it cleaner to put this output into it’s ...

May 4, 2022
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How to find out which package version is loaded in R?

I am in a process of figuring out how to use my university cluster. It has 2 versions of R installed. System wide ...

May 3, 2022
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Quickly reading very large tables as dataframes

I have very large tables (30 million rows) that I would like to load as a dataframes in R. read.table() has a lot ...

May 1, 2022
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Create an empty data.frame

I’m trying to initialize a data.frame without any rows. Basically, I want to specify the data types for each column and name them, ...

May 1, 2022
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Drop unused factor levels in a subsetted data frame

I have a data frame containing a factor. When I create a subset of this dataframe using subset or another indexing function, a ...

April 30, 2022
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Run R script from command line

I have a file, called a.r, it has a chmod of 755, sayHello <- function(){ print('hello') } sayHello() How can I run this ...

April 30, 2022
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Test if a vector contains a given element

How to check if a vector contains a given value? 7 s 7

April 30, 2022
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