| align | Align a 'data.table' onto a 'nanotime' vector | 
| align-method | Align a 'data.table' onto a 'nanotime' vector | 
| align_idx | Get the index of the alignment of one vector onto another | 
| align_idx-method | Get the index of the alignment of one vector onto another | 
| frequency-method | Return the number of observations per interval | 
| grid_align | Align a 'data.table' onto a 'nanotime' vector grid | 
| grid_align-method | Align a 'data.table' onto a 'nanotime' vector grid | 
| ops | Arithmetic operations on two 'data.table' time-series | 
| ops-method | Arithmetic operations on two 'data.table' time-series |