Get Names of Value Columns
## S3 method for class 'DTSg' cols(x, class = NULL, pattern = NULL, ...)
x | 
 A   | 
class | 
 An optional character vector matched to the most specific class
(first element) of each column's   | 
pattern | 
 An optional character string passed on to the   | 
... | 
 Further arguments passed on to   | 
Returns a character vector.
# new DTSg object x <- DTSg$new(values = flow) # get names of numeric columns ## R6 method x$cols(class = "numeric") ## S3 method cols(x = x, class = "numeric")
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