An axis
is an instance of a dimension.
nc_axis(x, i)
# S3 method for character
nc_axis(x, i)
# S3 method for NetCDF
nc_axis(x, i)
NetCDF source
index of axis (1-based, 0 is "empty")
Each data source has a set of dimensions available for use by variables. Each axis is a 1-dimensional instance.