r Archives - Page 4 of 18

Programming, r

IT Nursery

Convert data.frame column to a vector?

I have a dataframe such as: a1 = c(1, 2, 3, 4, 5) a2 = c(6, 7, 8, 9, 10) a3 = c(11, ...

May 31, 2022
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Programming, r

IT Nursery

Determine the data types of a data frame’s columns

I’m using R and have loaded data into a dataframe using read.csv(). How do I determine the data type of each column in ...

May 31, 2022
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performance, Programming

IT Nursery

Speed up the loop operation in R

I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new ...

May 30, 2022
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Programming, r

IT Nursery

How can I handle R CMD check “no visible binding for global variable” notes when my ggplot2 syntax is sensible?

EDIT: Hadley Wickham points out that I misspoke. R CMD check is throwing NOTES, not Warnings. I’m terribly sorry for the confusion. It ...

May 30, 2022
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Programming, r

IT Nursery

How to prevent ifelse() from turning Date objects into numeric objects

I am using the function ifelse() to manipulate a date vector. I expected the result to be of class Date, and was surprised ...

May 30, 2022
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Programming, r

IT Nursery

How to suppress warnings globally in an R Script

I have a long R script that throws some warnings, which I can ignore. I could use suppressWarnings(expr) for single statements. But how ...

May 30, 2022
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Programming, r

IT Nursery

Relative frequencies / proportions with dplyr

Suppose I want to calculate the proportion of different values within each group. For example, using the mtcars data, how do I calculate ...

May 30, 2022
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Programming, r

IT Nursery

How to assign colors to categorical variables in ggplot2 that have stable mapping?

I’ve been getting up to speed with R in the last month. Here is my question: What is a good way to assign ...

May 30, 2022
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Programming, r

IT Nursery

Mean per group in a data.frame [duplicate]

This question already has answers here: Aggregate / summarize multiple variables per group (e.g. sum, mean) (8 answers) Calculate the mean by group ...

May 30, 2022
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Programming, r

IT Nursery

“Correct” way to specifiy optional arguments in R functions

I am interested in what is the “correct” way to write functions with optional arguments in R. Over time, I stumbled upon a ...

May 29, 2022
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