ProcGPA: Workhorse function for procSym, responsible for Procrustes...

In Morpho: Calculations and Visualisations Related to Geometric Morphometrics

Workhorse function for procSym, responsible for Procrustes registration

Description

Workhorse function for procSym, responsible for Procrustes registration

Usage

ProcGPA(
  dat.array,
  tol = 1e-05,
  scale = TRUE,
  CSinit = FALSE,
  silent = TRUE,
  weights = NULL,
  centerweight = FALSE,
  reflection = TRUE,
  pcAlign = TRUE
)

Arguments

dat.array	Input k x m x n real array, where k is the number of points, m is the number of dimensions, and n is the sample size.
tol	numeric: Threshold for convergence during iterative superimpositioning.
scale	logical: indicating if scaling is requested
CSinit	logical: if TRUE, all configurations are initially scaled to Unit Centroid Size.
silent	logical: suppress output of elapsed time.
weights	numeric vector: assign per landmark weights.
centerweight	logical: if TRUE, the landmark configuration is scaled according to weights during the rotation process, instead of being scaled to the Centroid size.
reflection	logical: allow reflections.
pcAlign	logical: if TRUE, the shapes are aligned by the principal axis of the first specimen, otherwise the orientation of the first specimen is used.

Value

returns a list with

rotated	k x m x n array of the rotated configurations
mshape	sample meanshape

Author(s)

Stefan Schlager

References

Goodall C. 1991. Procrustes methods in the statistical analysis of shape. Journal of the Royal Statistical Society. Series B. Statistical Methodology 53:285-239.

Dryden IL, Mardia KV. 1998. Statistical shape analysis. John Wiley and sons, Chichester.

See Also

procSym, rotonto

Examples

data(boneData)
proc <- ProcGPA(boneLM, CSinit=TRUE, silent=TRUE)
#now we landmarks 5 - 9 double the weight as  the others
weights <- c(rep(1,4),rep(2,5),1)
proc.wt <- ProcGPA(boneLM, CSinit=TRUE, weights=weights, silent=TRUE)

Morpho documentation built on June 22, 2024, 7:19 p.m.