SpaDES (version 1.0.1)

heading: Heading between spatial points.

Description

Determines the heading between spatial points.

Usage

heading(from, to)

## S3 method for class 'SpatialPoints,SpatialPoints':
heading(from, to)

## S3 method for class 'matrix,matrix':
heading(from, to)

## S3 method for class 'matrix,SpatialPoints':
heading(from, to)

## S3 method for class 'SpatialPoints,matrix':
heading(from, to)

Arguments

from

The starting position; an object of class SpatialPoints.

to

The ending position; an object of class SpatialPoints.

Value

• The heading between the points, in degrees.

Examples

require(sp)
N <- 10L                # number of agents
x1 <- stats::runif(N, -50, 50) # previous X location
y1 <- stats::runif(N, -50, 50) # previous Y location
x0 <- stats::rnorm(N, x1, 5)   # current X location
y0 <- stats::rnorm(N, y1, 5)   # current Y location

# using SpatialPoints
prev <- SpatialPoints(cbind(x=x1, y=y1))
curr <- SpatialPoints(cbind(x=x0, y=y0))
heading(prev, curr)

# using matrix
prev <- matrix(c(x1, y1), ncol=2, dimnames=list(NULL, c("x","y")))
curr <- matrix(c(x0, y0), ncol=2, dimnames=list(NULL, c("x","y")))
heading(prev, curr)

#using both
prev <- SpatialPoints(cbind(x=x1, y=y1))
curr <- matrix(c(x0, y0), ncol=2, dimnames=list(NULL, c("x","y")))
heading(prev, curr)

prev <- matrix(c(x1, y1), ncol=2, dimnames=list(NULL, c("x","y")))
curr <- SpatialPoints(cbind(x=x0, y=y0))
heading(prev, curr)