is_equallyspacedradii: Tests if coordinates likely have equally spaced radii

In Momocs: Morphometrics using R

Tests if coordinates likely have equally spaced radii

Description

Returns TRUE/FALSE whether the sd of angles between all successive radii is below/above thesh

Usage

is_equallyspacedradii(coo, thres)

Arguments

coo	matrix of ⁠(x; y)⁠ coordinates or any Coo object.
thres	numeric a threshold (arbitrarily pi/90, eg 2 degrees, by default)

Value

a single or a vector of logical. If NA are returned, some coordinates are likely identical, at least for x or y.

See Also

Other coo_ utilities: coo_aligncalliper(), coo_alignminradius(), coo_alignxax(), coo_align(), coo_baseline(), coo_bookstein(), coo_boundingbox(), coo_calliper(), coo_centdist(), coo_center(), coo_centpos(), coo_close(), coo_down(), coo_dxy(), coo_extract(), coo_flipx(), coo_force2close(), coo_interpolate(), coo_is_closed(), coo_jitter(), coo_left(), coo_likely_clockwise(), coo_nb(), coo_perim(), coo_range(), coo_rev(), coo_right(), coo_rotatecenter(), coo_rotate(), coo_sample_prop(), coo_samplerr(), coo_sample(), coo_scale(), coo_shearx(), coo_slice(), coo_slidedirection(), coo_slidegap(), coo_slide(), coo_smoothcurve(), coo_smooth(), coo_template(), coo_trans(), coo_trimbottom(), coo_trimtop(), coo_trim(), coo_untiltx(), coo_up()

Examples

bot[1] %>% is_equallyspacedradii
bot[1] %>% coo_samplerr(36) %>% is_equallyspacedradii
# higher tolerance but wrong
bot[1] %>% coo_samplerr(36) %>% is_equallyspacedradii(thres=5*2*pi/360)
# coo_interpolate is a better option
bot[1] %>% coo_interpolate(1200) %>% coo_samplerr(36) %>% is_equallyspacedradii
# Coo method
bot %>% coo_interpolate(360) %>% coo_samplerr(36) %>% is_equallyspacedradii

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