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First of all, I need to initialize an empty vector in R, Does the following work ?
vec <- vector()
And how I can evaluate whether vec is empty or not ?
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To check if list is empty in R programming, we have to evaluate the condition that the length of list is zero. Call length() function with this list passed as argument and if the return value is 0 using equal to operator.
Many people forget that functions like str_locate_all() require %>% unlist() or %>% . [[1]] . Then you can easily detect character(0) with the length() function if > 0 one can safely use the output of str_locate_all() for example.
You can check if a column is empty with the all() function. If all the values of a column are NA's or missing, then the all() function returns TRUE.
It seems that using length(vector_object) works:
vector.is.empty <- function(x) return(length(x) ==0 )
> v <- vector()
> class(v)
[1] "logical"
> length(v)
[1] 0
> vector.is.empty(v)
[1] TRUE
>
> vector.is.empty(c())
[1] TRUE
> vector.is.empty(c(1)[-1])
[1] TRUE
Please tell if there is any case not covered.
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