dmatrix.df: Distance matrix to data.frame
In jeffreyevans/GeNetIt: Spatial Graph-Theoretic Genetic Gravity Modelling

dmatrix.df

R Documentation

Distance matrix to data.frame

Description

Coerces distance matrix to a data.frame object

Usage

dmatrix.df(x, rm.diag = TRUE)

Arguments

`x`	Symmetrical distance matrix
`rm.diag`	(TRUE/FALSE) remove matrix diagonal, self values.

Value

data.frame object representing to and from values

Note

Function results in data.frame object with "X1" (FROM), "X2" (TO) and "distance" columns. The FROM column represents to origin ID, TO represents destination ID and distance is the associated matrix distance. These results can be joined back to the graph object using either the origin or destination ID's.

Author(s)

Jeffrey S. Evans <jeffrey_evans@tnc.org> and Melanie A. Murphy <melanie.murphy@uwyo.edu>

Examples

 library(sf)
 pts <- data.frame(ID=paste0("ob",1:15), x=runif(15, 480933, 504250), 
                   y=runif(15, 4479433, 4535122))
   pts <- st_as_sf(pts, coords = c("x", "y"), 
                   crs = 32611, agr = "constant") 
 
 # Create distance matrix  
 dm <- st_distance(pts)
   class(dm) <- setdiff(class(dm), "units")  
     attr(dm, "units") <- NULL
   colnames(dm) <- pts$ID 
   rownames(dm) <- pts$ID
 
 # Coerce to data.frame with TO and FROM ID's and associated distance
 dm.df <- dmatrix.df(dm)
   head(dm.df)

jeffreyevans/GeNetIt documentation built on June 28, 2023, 5:14 a.m.