# comat v0.8.2

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## Creates Co-Occurrence Matrices of Spatial Data

Builds co-occurrence matrices based on spatial raster data. It includes creation of weighted co-occurrence matrices (wecoma) and integrated co-occurrence matrices (incoma; Vadivel et al. (2007) <doi:10.1016/j.patrec.2007.01.004>).

# comat

The goal of comat is to create co-occurrence matrices based on spatial data, including a weighted co-occurrence matrix (wecoma) and an integrated co-occurrence matrix (incoma).

## Installation

You can install the released version of comat from CRAN with:

install.packages("comat")


You can install the development version from GitHub with:

# install.packages("remotes")


## Example

This is a basic example which shows you how to create a weighted co-occurrence matrix (wecoma) based on two simple rasters (for simplicity presented as matrices). The first one raster_x represents some categories, and the second one raster_w represents weights.

library(comat)
library(raster)
data(raster_x, package = "comat")
data(raster_w, package = "comat")
raster_x
#>      [,1] [,2] [,3]
#> [1,]    1    1    3
#> [2,]    1    3    3
#> [3,]    2    2    3
raster_w
#>      [,1] [,2] [,3]
#> [1,]    2    2    9
#> [2,]    6    4    9
#> [3,]    4    8    9


The get_wecoma() function can be next used to create a weighted co-occurrence matrix.

get_wecoma(
raster_x,
raster_w,
neighbourhood = 4
)
#>      1    2    3
#> 1 12.0  5.0 13.5
#> 2  5.0 12.0 14.5
#> 3 13.5 14.5 49.0


This function allows for some parametrization using additional arguments, e.g.:

get_wecoma(
raster_x,
raster_w,
neighbourhood = 4,
fun = "focal",
na_action = "keep"
)
#>    1  2  3
#> 1 12  6 10
#> 2  4 12 16
#> 3 17 13 49


## Contribution

Contributions to this package are welcome. The preferred method of contribution is through a GitHub pull request. Feel free to contact me by creating an issue.

## Functions in comat

 Name Description get_cocove Create a co-located co-occurrence vector (cocove) raster_x_na A matrix with categories and missing values raster_x A matrix with categories raster_w A matrix with weights raster_w_na A matrix with weights and missing values rcpp_xy_from_matrix Coordinates from a matrix rcpp_cell_from_xy Get cell number create_neighborhood Create neighborhood coordinates get_wecoma Create a weighted co-occurrence matrix (wecoma) get_incoma Create an integrated co-occurrence matrix (incoma) get_cocoma Create a co-located co-occurrence matrix (cocoma) get_coma Create a co-occurrence matrix (coma) get_incove Create an integrated co-occurrence vector (incove) get_cove Create a co-occurrence vector (cove) comat-package comat: Creates Co-Occurrence Matrices of Spatial Data get_wecove Create a weighted co-occurrence vector (wecove) No Results!