rray_dim_n() computes the dimensionality (i.e. the number of dimensions).
An integer vector containing the number of dimensions of
One point worth mentioning is that
rray_dim_n() is very strict. It does
not simply call the generic function
dim() and then check the length.
Rather, it explicitly pulls the attribute for the
"dim", and checks
the length of that. If an object does not have an attribute, then the
dimensionality is 1.
This means that data frames have a dimensionality of 1, even though
dim() defines a method for data frames that would imply a dimensionality
#>  2# NULL has a dimensionality of 1 rray_dim_n(NULL)#>  1# The dimensionality of a data frame is 1 rray_dim_n(data.frame())#>  1