dd_mi: dd_mi

In mpadge/distdecay: Calculate Distance Decay Functions

Description

Calculate station-to-station mutual information matrix for a given city. Upper diagonal of matrix is between all trips from i and j, so dd_cov()[i, j] holds the covariance between all trips from station i to all other stations and from station j to all other stations. Analogously, the lower diagonal (dd_cov()[j, i]) holds covariances between all trips to i and j.

Usage

dd_mi(city, lower = 0, upper = 1, osm = TRUE)

Arguments

city	City for which mutual information matrix is to be extracted
lower	Lower limit (0-1) for distance cutoff used to calculate covariances (see details)
upper	Upper limit (0-1) for distance cutoff used to calculate covariances (see details)
osm	If FALSE, return straight-line distances, otherwise street network distances.

Note

The directory from which trip matrices are loaded can be retrieveed with dd_get_data_dir, and set with dd_set_data_dir.

mpadge/distdecay documentation built on May 24, 2019, 6:08 a.m.