What is the which function in R?

What is the which function in R?

The which() function in R returns the position or the index of the value which satisfies the given condition. The Which() function in R gives you the position of the value in a logical vector. The position can be of anything like rows, columns and even vector as well.

What is with () and by () function in R is used for?

Definition of with & within: The with function evaluates an R expression in an environment constructed based on a data frame. The within function evaluates an R expression in an environment constructed based on a data frame AND modifies the original data.

What is the use of with () function in R?

With R with() function, we can operate on R expressions as well as the process of calling that function in a single go! That is with() function enables us to evaluate an R expression within the function to be passed as an argument. It works on data frames only.

How do you write a function in R programming?

Key Points

1. Define a function using name <- function(…
2. Call a function using name(…
3. R looks for variables in the current stack frame before looking for them at the top level.
4. Use help(thing) to view help for something.
5. Put comments at the beginning of functions to provide help for that function.
6. Annotate your code!

How do I load a function in R?

How to Source Functions in R

1. Create a new R Script (. R file) in the same working directory as your . Rmd file or R script. Give the file a descriptive name that captures the types of functions in the file.
2. Open that R Script file and add one or more functions to the file.
3. Save your file.

What is Ave function in R?

ave: Group Averages Over Level Combinations of Factors Subsets of x[] are averaged, where each subset consist of those observations with the same factor levels.

Why is R programming used instead of MS Excel?

Excel’s spreadsheets have a finite number of rows and columns, however, so you’ll be unable to analyze massive datasets that can be handled with R. R allows you to clean and organize data, gives more visualization options, and if there’s a topic you want to explore, then there’s likely a way to do it in R.

How do you create a user defined function in R?

You can also use a user-defined function in an R if-else statement:

1. userDefinedFunction <- function(x){
2. result <- x * 10.
3. print(result)
4. }
5. x <- list(85, 86, 87, 87, 90, 93, 107, 54, 99)
6. if(length(x) < 10){
7. userDefinedFunction(mean(as. numeric(c(x))))
8. }else if(length(x) >= 10){

How do you source a function in R?

To source a set of functions in R :

1. Create a new R Script (. R file) in the same working directory as your . Rmd file or R script. Give the file a descriptive name that captures the types of functions in the file.
2. Open that R Script file and add one or more functions to the file.
3. Save your file.

How do you find a function in R?

Definitions of apropos & find: The apropos R function returns a character vector giving the names of objects that contain the input character (partially). The find R function returns the location where objects of a given name can be found.

How do you write a function in R?

Writing Functions in R. All of the work in R is done by functions, down to the lowest level. For example, there’s a function named “+” that does addition. There are perhaps 2000 or so functions built in to R, many of which never get called by the user directly but serve to help out other functions.

What are the functions of R?

In R, a function is an object so the R interpreter is able to pass control to the function, along with arguments that may be necessary for the function to accomplish the actions. The function in turn performs its task and returns control to the interpreter as well as any result which may be stored in other objects.

What is the sum function in R?

The sum function in R is a special one in contrast to other summary statistics functions such as mean and median. The first distinguish is that it is a Primitive function where the others are not (Although you can call mean using .Internal).

Do call in R?

The do.call function R has an interesting function called do.call. This function allows you to call any R function, but instead of writing out the arguments one by one, you can use a list to hold the arguments of the function. While it may not seem useful on the surface, a simple example will help to show how powerful do.call is.