head.dm_zoomed {dm}

utils table manipulation methods for dm_zoomed objects

Description

Extract the first or last rows from a table. Use these methods without the '.dm_zoomed' suffix (see examples). The methods for regular dm objects extract the first or last tables.

Usage

## S3 method for class 'dm_zoomed'
head(x, n = 6L, ...)

## S3 method for class 'dm_zoomed'
tail(x, n = 6L, ...)

Arguments

x

object of class dm_zoomed

n

an integer vector of length up to dim(x) (or 1, for non-dimensioned objects). A logical is silently coerced to integer. Values specify the indices to be selected in the corresponding dimension (or along the length) of the object. A positive value of n[i] includes the first/last n[i] indices in that dimension, while a negative value excludes the last/first abs(n[i]), including all remaining indices. NA or non-specified values (when length(n) < length(dim(x))) select all indices in that dimension. Must contain at least one non-missing value.

...

arguments to be passed to or from other methods.

Details

see manual for the corresponding functions in utils.

Value

A dm_zoomed object.

Examples

zoomed <- dm_nycflights13() %>%
  dm_zoom_to(flights) %>%
  head(4)
zoomed
dm_insert_zoomed(zoomed, new_tbl_name = "head_flights")