Lists the missing values of selected columns of a DTSg object with
recognised periodicity.
# S3 method for class 'DTSg'
nas(x, cols = self$cols(), ...)A DTSg object (S3 method only).
A character vector specifying the columns whose missing values
shall be listed. Another possibility is a character string containing
either comma separated column names, for example, "x,y,z", or the start
and end column separated by a colon, for example, "x:z".
Not used (S3 method only).
Returns a data.table::data.table with five columns:
.col: the column name
.group: the ID of the missing values group within each column
.from: the first timestamp of the missing values group
.to: the last timestamp of the missing values group
.n: the number of missing values per group
# new DTSg object
x <- DTSg$new(values = flow)
# list missing values
## R6 method
x$nas()
#> .col .group .from .to .n
#> <char> <int> <POSc> <POSc> <int>
#> 1: flow 1 2007-10-12 2007-10-24 13
#> 2: flow 2 2007-10-26 2007-11-03 9
#> 3: flow 3 2007-11-10 2007-11-10 1
## S3 method
nas(x = x)
#> .col .group .from .to .n
#> <char> <int> <POSc> <POSc> <int>
#> 1: flow 1 2007-10-12 2007-10-24 13
#> 2: flow 2 2007-10-26 2007-11-03 9
#> 3: flow 3 2007-11-10 2007-11-10 1