rfourier_i uses the inverse radii variation (equally spaced radii) transformation to
calculate a shape, when given a list with Fourier coefficients, typically
obtained computed with rfourier.
rfourier_i(rf, nb.h, nb.pts = 120)A list with components:
vector of
x-coordinates.
vector of y-coordinates.
vector of angles used.
vector of radii
calculated.
A list with ao, an and bn components,
typically as returned by rfourier.
integer. The number of harmonics to calculate/use.
integer. The number of points to calculate.
See the JSS paper for the maths behind.
Claude, J. (2008) Morphometrics with R, Use R! series, Springer 316 pp.
Other rfourier:
rfourier_shape(),
rfourier()
data(bot)
coo <- coo_center(bot[1]) # centering is almost mandatory for rfourier family
coo_plot(coo)
rf <- rfourier(coo, 12)
rf
rfi <- rfourier_i(rf)
coo_draw(rfi, border='red', col=NA)
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