<filename>examples/large_memory_tests/bicubic.py
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# Copyright 2021 <NAME>
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import numpy as np

from SurfaceTopography.Support.Interpolation import Bicubic

nx = ny = 8192
tol = 1e-9

NPARA = 4 * 4
print(f"Estimated memory requirement: {nx * ny * np.dtype('f8').itemsize * (NPARA + 1) / 1024. / 1024. / 1024.} GB")

field = np.random.random([nx, ny])
interp = Bicubic(field)
for i in range(nx):
    for j in range(ny):
        assert abs(interp(i, j) - field[i, j]) < tol

x, y = np.mgrid[:nx, :ny]

for der in [0, 1, 2]:
    if der == 0:
        interp_field = interp(x, y, derivative=der)
    elif der == 1:
        interp_field, _, _ = interp(x, y, derivative=der)
    else:
        interp_field, _, _, _, _, _ = interp(x, y, derivative=der)
    assert np.allclose(interp_field, field)
