spatstat (version 1.60-1)

angles.psp: Orientation Angles of Line Segments

Description

Computes the orientation angle of each line segment in a line segment pattern.

Usage

angles.psp(x, directed=FALSE)

Arguments

x

A line segment pattern (object of class "psp").

directed

Logical flag. See details.

Value

Numeric vector.

Details

For each line segment, the angle of inclination to the \(x\)-axis (in radians) is computed, and the angles are returned as a numeric vector.

If directed=TRUE, the directed angle of orientation is computed. The angle respects the sense of direction from (x0,y0) to (x1,y1). The values returned are angles in the full range from \(-\pi\) to \(\pi\). The angle is computed as atan2(y1-y0,x1-x0). See atan2.

If directed=FALSE, the undirected angle of orientation is computed. Angles differing by \(\pi\) are regarded as equivalent. The values returned are angles in the range from \(0\) to \(\pi\). These angles are computed by first computing the directed angle, then adding \(\pi\) to any negative angles.

See Also

psp, marks.psp, summary.psp, midpoints.psp, lengths.psp, endpoints.psp, extrapolate.psp.

Examples

# NOT RUN {
  a <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
  b <- angles.psp(a)   
# }