RNewsflow (version 1.0.1)

filter.window: Filter edges from the document similarity network based on hour difference

Description

The `filter.window` function can be used to filter the document pairs (i.e. edges) using the `hour.window` parameter, which works identical to the `hour.window` parameter in the `newsflow.compare` function. In addition, the `from.vertices` and `to.vertices` parameters can be used to select the vertices (i.e. documents) for which this filter is applied.

Usage

filter.window(g, hour.window, to.vertices = NULL, from.vertices = NULL)

Arguments

g

A document similarity network, as created with newsflow.compare or document.network

hour.window

A vector of length 2, in which the first and second value determine the left and right side of the window, respectively. For example, c(-10, 36) will compare each document to all documents between the previous 10 and the next 36 hours.

to.vertices

A filter to select the vertices `to` which an edge is filtered. For example, if `V(g)$sourcetype == "newspaper"` is used, then the hour.window filter is only applied for edges `to` newspaper documents (specifically, where the sourcetype attribute is "newspaper").

from.vertices

A filter to select the vertices `from` which an edge is filtered. Works identical to `to.vertices`.

Value

A network/graph in the igraph class

Details

It is recommended to use the show.window function to verify whether the hour windows are correct according to the assumptions and focus of the study.

Examples

data(docnet)
show.window(docnet, to.attribute = 'source') # before filtering

docnet = filter.window(docnet, hour.window = c(0.1,24))

docnet = filter.window(docnet, hour.window = c(6,36), 
                       to.vertices = V(docnet)$sourcetype == 'Print NP')

show.window(docnet, to.attribute = 'sourcetype') # after filtering per sourcetype
show.window(docnet, to.attribute = 'source') # after filtering per source