Seeking a unique match of elements in R Programming – char.expand() Function
char.expand() function in R Language is used to seek a unique match of its first argument among the elements of its second. If successful, it returns this element; otherwise, it performs an action specified by the third argument.
Syntax: char.expand(input, target, nomatch = stop(“no match”))
Parameters:
input: character string to be expanded
target: character vector with the values to be matched against
nomatch: an R expression to be evaluated in case expansion was not possible
Example 1:
Python3
# R program to illustrate # char.expand function # Creating string vector x < - c( "sand" , "and" , "land" ) # Calling char.expand() function char.expand( "a" , x, warning( "no expand" )) char.expand( "an" , x, warning( "no expand" )) char.expand( "and" , x, warning( "no expand" )) |
Output :
[1] "and" [1] "and" [1] "and"
Example 2:
Python3
# R program to illustrate # char.expand function # Creating string vector x < - c( "sand" , "and" , "land" ) # Calling char.expand() function char.expand( "G" , x, warning( "no expand" )) |
Output:
[1] NA Warning message: In eval(nomatch) : no expand