adjPairsMatrix

Computes 4- or 8-direction neighbour pairs (from, to) for every input cell
and filters out neighbours that fall off the raster top/bottom or wrap
across left/right edges. Returns a 2-column integer matrix with column
names "from" and "to". Equivalent to adj(..., pairs = TRUE) but without
the data.table allocation/coercion overhead.

internal

Provides GIS and map utilities, plus additional modeling
tools for developing cellular automata, dynamic raster models, and
agent based models in 'SpaDES'.  Included are various methods for
spatial spreading, spatial agents, GIS operations, random map
generation, and others.  See '?SpaDES.tools' for a categorized
overview of these additional tools.

Alex M Chubaty

SpaDES.tools

Additional Tools for Developing Spatially Explicit Discrete
Event Simulation (SpaDES) Models

Eliot J B McIntire

Yong Luo

Ceres Barros

Steve Cumming

Jean Marchal

His Majesty the King in Right of Canada, as represented by the Minister of Natural Resources Canada 

adjPairsMatrix function

<dl><dt>cells</dt>
<dd>integer vector of source cell indices (1-based)</dd>
<dt>numCol</dt>
<dd>integer; number of raster columns</dd>
<dt>numCell</dt>
<dd>integer; total number of raster cells</dd>
<dt>directions</dt>
<dd>integer; either 4 or 8</dd></dl>

Arguments

Adjacent-pairs matrix used by spread() hot loop — adjPairsMatrix

<dl>

<dt>cells</dt>
<dd>integer vector of source cell indices (1-based)</dd>


<dt>numCol</dt>
<dd>integer; number of raster columns</dd>


<dt>numCell</dt>
<dd>integer; total number of raster cells</dd>


<dt>directions</dt>
<dd>integer; either 4 or 8</dd>

</dl>

adjPairsMatrix: Adjacent-pairs matrix used by spread() hot loop

Description

Usage

Value

Arguments