angles.psp: Orientation Angles of Line Segments

In spatstat: Spatial Point Pattern Analysis, Model-Fitting, Simulation, Tests

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.

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 -π to π. 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 π are regarded as equivalent. The values returned are angles in the range from 0 to π. These angles are computed by first computing the directed angle, then adding π to any negative angles.

Value

Numeric vector.

Author(s)

\adrian

and \rolf

See Also

summary.psp, midpoints.psp, lengths.psp

Examples

  a <- psp(runif(10), runif(10), runif(10), runif(10), window=owin())
  b <- angles.psp(a)   

spatstat documentation built on May 30, 2017, 7:53 a.m.

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