dfourier_shape: Calculates and draws 'dfourier' shapes
In Momocs: Morphometrics using R

dfourier_shape

R Documentation

Calculates and draws 'dfourier' shapes

Description

Calculates shapes based on 'Discrete cosine transforms' given harmonic coefficients (see dfourier) or can generate some random 'dfourier' shapes. Mainly intended to generate shapes and/or to understand how dfourier works.

Usage

dfourier_shape(A, B, nb.h, nb.pts = 60, alpha = 2, plot = TRUE)

Arguments

`A`	vector of harmonic coefficients
`B`	vector of harmonic coefficients
`nb.h`	if `A` and/or `B` are not provided, the number of harmonics to generate
`nb.pts`	if `A` and/or `B` are not provided, the number of points to use to reconstruct the shapes
`alpha`	The power coefficient associated with the (usually decreasing) amplitude of the harmonic coefficients (see efourier_shape)
`plot`	logical whether to plot the shape

Value

a list of shapes or a plot

Examples

# some signatures
panel(coo_align(Opn(replicate(48, dfourier_shape(alpha=0.5, nb.h=6)))))
# some worms
panel(coo_align(Opn(replicate(48, dfourier_shape(alpha=2, nb.h=6)))))

Momocs documentation built on Nov. 13, 2023, 5:07 p.m.