To check if a value is null or false, you can use the is.null() and is.False() functions respectively. Here are some examples:
1. Using is.null():
my_var <- NULL
is.null(my_var) # Returns TRUE because my_var is null
2. Using is.False():
my_var <- FALSE
is.False(my_var) # Returns TRUE because my_var has a value of FALSE
To check true, we can use is.True() function:
my_var <- TRUE
is.True(my_var) # Returns TRUE because my_var has a value of TRUE
These functions can be used to check if a variable has a null/false value and can be useful in controlling the flow of your program.