Momocs (version 1.2.9)

coo_angle_tangent: Calculates the tangent angle along the perimeter of a shape

Description

Calculated using complex numbers and returned in radians minus the first one (modulo 2*pi).

Usage

coo_angle_tangent(coo)
# S3 method for default
coo_angle_tangent(coo)
# S3 method for Coo
coo_angle_tangent(coo)
coo_tangle(coo)

Arguments

coo

a matrix of coordinates or any Coo

Value

numeric, the tangent angle along the perimeter, or a list of those for Coo

See Also

tfourier

Other coo_ descriptors: coo_angle_edge1, coo_angle_edges, coo_area, coo_boundingbox, coo_chull, coo_circularity, coo_convexity, coo_eccentricity, coo_elongation, coo_length, coo_lw, coo_rectangularity, coo_rectilinearity, coo_solidity, coo_width

Examples

# NOT RUN {
b <- bot[1]
phi  <- coo_angle_tangent(b)
phi2 <- coo_angle_tangent(coo_smooth(b, 2))
plot(phi, type='l')
plot(phi2, type='l', col='red') # ta is very sensible to noise

# on Coo
bot %>% coo_angle_tangent
# }