Interpolate a surface over a grid — tda_interp • tdaR

Interpolate a surface over a grid

Usage

tda_interp(x, y, z, rx, ry, options = list(), dir = tempfile("tda"))

Arguments

x, y, z: the surface: a point cloud in three variables.
rx, ry: the grids to interpolate over.
options: a named list of further TDA options, passed through.
dir: working directory.

Value

An object carrying a table: one row per grid point, x, y and the interpolated z.

See also

Other smoothing: tda_integrate(), tda_isotonic(), tda_mat(), tda_sma(), tda_smd(), tda_spl()

Examples

# a plane z = x + 2y, evaluated back on its own grid
g <- expand.grid(x = 1:5, y = 1:5)
g$z <- g$x + 2 * g$y
head(tda_interp(g$x, g$y, g$z, rx = 1:5, ry = 1:5)$table)
#>   x y  z
#> 1 1 1  3
#> 2 1 2  5
#> 3 1 3  7
#> 4 1 4  9
#> 5 1 5 11
#> 6 2 1  4