Maxima and Minima for date_xx
# S3 method for date_xx Summary(..., na.rm)
... |
|
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na.rm | logical: should missing values be removed? |
for min()
and max()
a scalar of the same date_xx
subclass as it's
input, for range a vector of length 2
#> [1] "2014-Q1"#> Error : All inputs must have the same <date_xx> subclass