rellipsoid: Sample points Roughly Uniformly on the surface of an...
In antiphon/Kdirectional: Analysis of anisotropy in point patterns using second order statistics
View source: R/from_ellipsoid_rellipsoid.R
rellipsoid R Documentation
Sample points Roughly Uniformly on the surface of an ellipsoid, 2D or 3D
Description
Sample points Roughly Uniformly on the surface of an ellipsoid, 2D or 3D
Usage
rellipsoid(n, axes = c(1, 1, 1), center, noise.sd = 0, R = NULL, pieces = 1000)
Arguments
axes
vector giving the semi-axis lengths
center
center vector, c(x,y) or c(x,y,z)
noise.sd
noise sd, 0=no noise
R
rotation matrix
pieces
Number of pieces to divide the surface into. See details.
Details
Sampling is done by first sampling uniformly on the surface of a
sphere and then transforming with the ellipsoid axes. Corrections:
* 2D: The sampling weights are set to piecewise linear approximation of the ellipse surface integral,
the resolution of which is controlled by 'pieces'.
* 3D: No weighting at the moment, so very biased for elongated ellipsoids.
Additional nD Gaussian noise can be added by setting 'noise.sd'>0.
antiphon/Kdirectional documentation built on Feb. 13, 2023, 6:26 a.m.
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View source: R/from_ellipsoid_rellipsoid.R
| rellipsoid | R Documentation |
Sample points Roughly Uniformly on the surface of an ellipsoid, 2D or 3D
Description
Sample points Roughly Uniformly on the surface of an ellipsoid, 2D or 3D
Usage
rellipsoid(n, axes = c(1, 1, 1), center, noise.sd = 0, R = NULL, pieces = 1000)
Arguments
axes |
vector giving the semi-axis lengths |
center |
center vector, c(x,y) or c(x,y,z) |
noise.sd |
noise sd, 0=no noise |
R |
rotation matrix |
pieces |
Number of pieces to divide the surface into. See details. |
Details
Sampling is done by first sampling uniformly on the surface of a sphere and then transforming with the ellipsoid axes. Corrections:
* 2D: The sampling weights are set to piecewise linear approximation of the ellipse surface integral, the resolution of which is controlled by 'pieces'. * 3D: No weighting at the moment, so very biased for elongated ellipsoids.
Additional nD Gaussian noise can be added by setting 'noise.sd'>0.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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