Momocs (version 1.2.9)

is_equallyspacedradii: 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_up

Examples

# NOT RUN {
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
# }