The writeLines() is a convenient built-in function in R for writing text lines to a file. It takes a character vector, where each element represents a line of text, and writes the lines to a specified file. If the file does not exist, it will be created; if it already exists, its contents will be … Read more
To convert data.frame columns from factors to character columns, you can use the lapply() function and as.data.frame(). Example # Create sample data with factor columns data <- data.frame( group = factor(c(“A”, “B”, “C”, “A”, “B”, “C”)), label = factor(c(“X”, “Y”, “Z”, “Y”, “Z”, “X”)), stringsAsFactors = TRUE ) # Print the original data with factor columns print(data) … Read more
To sum a variable by a group in R, you can use the following methods. Method 1: Using the aggregate() function Method 2: Using the dplyr package Method 3: Using the data.table package Method 1: Using the aggregate() function You can use the aggregate() function or the dplyr package to sum a variable by group. … Read more
Rotating and spacing axis labels in ggplot2 can be easily accomplished using the theme() and element_text() functions. The theme() function customizes the non-data components of a plot, such as titles, labels, fonts, backgrounds, gridlines, and legends. Follow the below steps to rotate and space axis labels in ggplot2. Step 1: Install and load the ggplot2 package … Read more
The walk() function is part of the purrr package in R that applies a function to each element of a list or vector, but unlike map(), it does not return anything. The walk() function takes two arguments: a list and a function. The function is applied to each element of the list in turn, and … Read more
The str_like() is a function from package stringr in R that tests whether a character string matches a pattern specified as a string. It returns a logical vector of the same length as the input vector, with TRUE suggesting a match and FALSE suggesting no match. Syntax str_like(string, pattern, ignore_case = TRUE) Parameters string: Input … Read more
There are the following methods to drop data frame columns by name in R. Method 1: Using the df_new <- subset(df, select = -c(col2, col4)) Method 2: Using the df_new <- df %>% select(-c(col2, col4)) Method 3: Using the !(names(DF) %in% drops)] Method 4: Using the setDT(df)[, c(“col2”, “col4”) := NULL] Method 5: Using the … Read more
The StrExtractBetween() is a convenience function from the DescTools package in R that extracts the parts of a string between the left and right delimiter. For example, you can extract the word “world” from the string “Hello world!”; you can use the StrExtractBetween(“Hello world!”, ” “, “!”) function, which will return “world”. Syntax StrExtractBetween(x, left, right, … Read more
StrExtract() function from the DescTools package in R extracts a part of a string, defined as a regular expression. This function uses the following syntax: StrExtract(x, pattern) where: x: a character vector where matches are sought; pattern: character string containing a regular expression. Syntax StrExtract(x, pattern, …) Parameters x: It is a character vector where … Read more
The getage() is a function from the eye package in R that calculates age in years, as durations or periods. It takes four arguments: from_date, to_date, period, and dec. The default value for to_date is the current date and time. Syntax getage(from_date, to_date = lubridate::now(), period = FALSE, dec = 1) Parameters from_date: It is … Read more