Causes of errors for the match. fun in R
Missing Argument
This error occurs when the match. fun function is called without providing a valid argument.
# Error Example
missing_argument <- match.fun()
# Example Numeric Vector
numeric_vector <- c(10, 15, 20, 25, 30)
# Applying the valid_function (mean) to the numeric vector
result <- missing_argument(numeric_vector)
# Printing the Result
print(result)
Output :
Error in match.fun() : argument "FUN" is missing, with no default
To avoid this error provide a valid function name or function object to match.fun() to resolve the error.
# Solution Example
correct_argument <- match.fun(mean)
# Example Numeric Vector
numeric_vector <- c(10, 15, 20, 25, 30)
# Applying the valid_function (mean) to the numeric vector
result <- correct_argument(numeric_vector)
# Printing the Result
print(result)
Output :
[1] 20
Incorrect Function Signature
This error occurs if a non-character, non-function argument is provided to match.fun()
# Error Example
incorrect_signature <- match.fun(1)
# Example Numeric Vector
numeric_vector <- c(10, 15, 20, 25, 30)
# Applying the correct_signature (mean) to the numeric vector
result <- incorrect_signature(numeric_vector)
# Printing the Result
print(result)
Output :
Error in match.fun(1) : '1' is not a function, character or symbol
To avoid this error supply a valid function name or a function object as an argument to match.fun().
# Solution Example
correct_signature <- match.fun(mean)
# Example Numeric Vector
numeric_vector <- c(10, 15, 20, 25, 30)
# Applying the correct_signature (mean) to the numeric vector
result <- correct_signature(numeric_vector)
# Printing the Result
print(result)
Output :
[1] 20
Invalid Function Name
This error arises when the specified function name is not a valid function in R. In the error example, “nonexistent_function” is not a recognized function.
# Error Example
invalid_function <- match.fun("nonexistent_function")
# Example Numeric Vector
numeric_vector <- c(100, 150, 200, 250, 300)
# Applying the valid_function (mean) to the numeric vector
result <- invalid_function(numeric_vector)
# Printing the Result
print(result)
Output :
Error in get(as.character(FUN), mode = "function", envir = envir) :
object 'nonexistent_function' of mode 'function' was not found
To avoid this error make sure the function name you give match.fun() as an argument is correct. Make sure the function name is spelt correctly.
# Solution Example
valid_function <- match.fun("mean")
# Example Numeric Vector
numeric_vector <- c(100, 150, 200, 250, 300)
# Applying the valid_function (mean) to the numeric vector
result <- valid_function(numeric_vector)
# Printing the Result
print(result)
Output :
[1] 200
How to Deal with Error in match.fun in R
The match. fun() function is essential for matching and evaluating functions in the context of the R Programming Language. However, when using this feature, users could run into issues. This article examines typical problems with match. fun() and offers workable solutions to manage them.