tps_raw: Vanilla Thin Plate Splines

In Momocs: Morphometrics using R

Vanilla Thin Plate Splines

Description

tps_raw calculates deformation grids and returns position of sampled points on it.

Usage

tps_raw(fr, to, amp = 1, over = 1.2, grid.size = 15)

Arguments

fr	the reference (x; y) coordinates
to	the target (x; y) coordinates
amp	an amplification factor of differences between fr and to
over	numeric that indicates how much the thin plate splines extends over the shapes
grid.size	numeric to specify the number of grid cells on the longer axis on the outlines

Value

a list with two components: grid the xy coordinates of sampled points along the grid; dim the dimension of the grid.

See Also

Other thin plate splines: tps2d(), tps_arr(), tps_grid(), tps_iso()

Examples

ms <- MSHAPES(efourier(bot, 10), "type")
b <- ms$shp$beer
w <- ms$shp$whisky
g <- tps_raw(b, w)
ldk_plot(g$grid)

# a wavy plot
ldk_plot(g$grid, pch=NA)
cols_ids <- 1:g$dim[1]
for (i in 1:g$dim[2]) lines(g$grid[cols_ids + (i-1)*g$dim[1], ])

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