as.rstack: Create an rstack pre-filled from a given input

In rstackdeque: Persistent Fast Amortized Stack and Queue Data Structures

Description

Creates a new rstack from a given input. Coerces input to a list first using as.list, the element at x[[1]] becomes the top of the new rstack.

Usage

as.rstack(x, ...)

Arguments

x	input to convert to a stack.
...	additional arguments to be passed to or from methods.

Details

Runs in O(N) in the size of the input. Because data frames return a list of columns when run through as.list, running as.rstack results in a stack of columns, rather than a stack of rows.

Value

a new rstack.

See Also

rstack.

Examples

s <- as.rstack(1:20)
print(s)

s <- as.rstack(1:200000)
print(s)

## A stack with only 5 elements, one for each column
oops <- as.rstack(iris)
print(oops)

Example output

An rstack with  20  elements. 
Top of the stack:
  : int 1
  : int 2
  : int 3
  : int 4
  : int 5
  : int 6
    ...An rstack with  200000  elements. 
Top of the stack:
  : int 1
  : int 2
  : int 3
  : int 4
  : int 5
  : int 6
    ...An rstack with  5  elements. 
 : num [1:150] 5.1 4.9 4.7 4.6 5 5.4 4.6 5 4.4 4.9 ...
 : num [1:150] 3.5 3 3.2 3.1 3.6 3.9 3.4 3.4 2.9 3.1 ...
 : num [1:150] 1.4 1.4 1.3 1.5 1.4 1.7 1.4 1.5 1.4 1.5 ...
 : num [1:150] 0.2 0.2 0.2 0.2 0.2 0.4 0.3 0.2 0.2 0.1 ...
 : Factor w/ 3 levels "setosa","versicolor",..: 1 1 1 1 1 1 1 1 1 1 ...

rstackdeque documentation built on May 2, 2019, 4:15 a.m.