grid.align-data.table-method: Align a 'data.table' onto a 'nanotime' vector grid
In lsilvest/dtts.utils: Utilities for data.table time-series

Description Usage Arguments Details Value Examples

grid.align returns the subset of data.table x that aligns on the grid defined by by, start and end

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## S4 method for signature 'data.table'
grid.align(x, by, func, ival = by, start = x[[1]][1],
  end = tail(x[[1]], 1))

`x`	the `data.table` time-series to align from
`by`	interval specified in nanoseconds
`func`	a function taking one argument and which provides an arbitrary aggregation of its argument; if `NULL` then a function which takes the closest observation is used.
`start`	scalar `nanotime` defining the start of the grid; by default the first element of `x` is taken.
`end`	scalar `nanotime` defining the end of the grid; by default the last element of `x` is taken.

A grid defined by the parameter by, start and end is created. The function then does a standard alignment of x onto this grid (see the align function)

a data.table time-series of the same length as y with the aggregations computed by func

## Not run: 
one_second <- 1e9
one_minute <- 60 * one_second
x <- data.table(index=nanotime(cumsum(sin(seq(0.001, pi, 0.001)) * one_second)), 1)
grid.align(x, as.integer64(one_minute), sum)

## End(Not run)