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sfourier
computes radii variation Fourier analysis from a matrix or a
list of coordinates where points are equally spaced aong the curvilinear abscissa.
sfourier(x, nb.h)# S3 method for default
sfourier(x, nb.h)
# S3 method for Out
sfourier(x, nb.h)
# S3 method for list
sfourier(x, nb.h)
A list with following components:
an
vector of
bn
vector of
ao
ao harmonic coefficient
r
vector of radii lengths
A list
or matrix
of coordinates or an Out
object
integer
. The number of harmonics to use. If missing, 12 is used on shapes;
99 percent of harmonic power on Out objects, both with messages.
Renaud S, Michaux JR (2003): Adaptive latitudinal trends in the mandible shape of Apodemus wood mice. J Biogeogr 30:1617-1628.
Other sfourier:
sfourier_i()
,
sfourier_shape()
molars[4] %>%
coo_center %>% coo_scale %>% coo_interpolate(1080) %>%
coo_slidedirection("right") %>%
coo_sample(360) %T>% coo_plot(zoom=2) %>%
sfourier(16) %>%
sfourier_i() %>%
coo_draw(bor="red", points=TRUE)
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