rotonmat: rotate matrix of landmarks

In Morpho: Calculations and Visualisations Related to Geometric Morphometrics

rotate matrix of landmarks

Description

rotate matrix of landmarks by using a rotation determined by two matrices.

Usage

rotonmat(
  X,
  refmat,
  tarmat,
  scale = TRUE,
  reflection = FALSE,
  weights = NULL,
  centerweight = FALSE,
  getTrafo = FALSE
)

Arguments

X	Matrix to be rotated
refmat	reference matrix used to estimate rotation parameters
tarmat	target matrix used to estimate rotation parameters
scale	logical: requests scaling to minimize sums of squared distances
reflection	logical: if TRUE, reflections are allowed.
weights	vector of length k, containing weights for each landmark.
centerweight	logical: if weights are defined and centerweigths=TRUE, the matrix will be centered according to these weights instead of the barycenter.
getTrafo	logical: if TRUE, a 4x4 transformation matrix will also be returned.

Details

A matrix is rotated by rotation parameters determined by two different matrices. This is usefull, if the rotation parameters are to be estimated by a subset of landmark coordinates.

Value

if getTrafo=FALSE the transformed X will be returned, else alist containing:

Xrot	the transformed matrix X
trafo	a 4x4 transformation matrix

Author(s)

Stefan Schlager

See Also

rotonto,rotmesh.onto

Examples

data(nose)
shortnose.rot <-
rotonmat(shortnose.lm,shortnose.lm[1:9,],longnose.lm[1:9,])

##view result
## Not run: 
deformGrid3d(shortnose.rot,shortnose.lm,ngrid=0)

## End(Not run)

Morpho documentation built on Feb. 16, 2023, 10:51 p.m.