To check if characters are present in the R string, you can use the “grepl()” function. The “grepl()” function returns TRUE if the specified sequence of characters is present in the string and FALSE if the specified sequence of characters is not present in the string. Example string_first <- “TheLastOfUs” value_first <- “L” grepl(value_first, string_first) … Read more
To create an empty data frame in R, “specify the column names and set the number of rows to 0 using the data.frame() function”. df <- data.frame(name = character(0), address = character(0), date = as.Date(character(0)), stringsAsFactors = FALSE) str(df) Output ‘data.frame’: 0 obs. of 3 variables: $ date: ‘Date’ num(0) $ file: chr $ user: … Read more
The if else statement in R “evaluates a condition and executes different statements based on whether the condition is TRUE or FALSE”. Syntax if (condition) { expression A } else { expression B } Here, the “condition” is an expression that evaluates to TRUE or FALSE. If the condition is TRUE, the code within the first … Read more
An operator in R is a symbol that tells the compiler to perform a mathematical or logical operation. Types of operators Arithmetic Operators Relational Operators Logical Operators Assignment Operators Miscellaneous Operators Arithmetic Operators in R Add(+) operator in R To add two vectors, you can use the “+ operator”. a <- c(1, 2, 3) b … Read more
Variables in R can store an atomic vector, a group of atomic vectors, or different R Objects. To consider a valid variable name in R, the name consists of letters, numbers, and a dot or underlined characters. In the current version of R, there is support for underscore (_) as a valid identifier. Still, it … Read more
R data types are the essential features that accept and store various data types. Some of the most common data types in R are: numeric: Decimal numbers like 10.5, 55, 787. integer: Whole numbers like 1L, 55L, and 100L (the letter “L” declares this as an integer). character: Strings of text like “hello”, “R”, and … Read more
Pi in R Pi is a built-in R constant whose value is 3.141593. The pi constant is the ratio of the circumference of a circle to its diameter. When you define a pi, please note that p of pi is in lowercase. Syntax pi Example print(pi) Output [1] 3.141593 The value of the pi constant … Read more
An array in R is a list or vector with two or more dimensions. An array is like a stacked matrix, and a matrix is a two-dimensional array. R arrays are objects which can store data in more than two dimensions. How to Create an Array in R To create an array in R, you can … Read more