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Add test for Modulation
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"""Tests for Modulation."""
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from phonopy import Phonopy
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from phonopy.structure.atoms import PhonopyAtoms
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lattice_NaCl222 = [
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[0.000000000000000, 5.690301476175671, 5.690301476175671],
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[5.690301476175671, 0.000000000000000, 5.690301476175671],
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[5.690301476175671, 5.690301476175671, 0.000000000000000],
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]
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positions_NaCl222 = [
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[0.00608478, 0.99337469, 0.00662531],
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[0.50608478, 0.99337469, 0.00662531],
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[0.99391522, 0.50662531, 0.99337469],
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[0.49391522, 0.50662531, 0.99337469],
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[0.99391522, 0.00662531, 0.49337469],
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[0.49391522, 0.00662531, 0.49337469],
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[0.00608478, 0.49337469, 0.50662531],
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[0.50608478, 0.49337469, 0.50662531],
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[0.24492438, 0.25552650, 0.24447350],
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[0.74492438, 0.25552650, 0.24447350],
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[0.25507562, 0.74447350, 0.25552650],
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[0.75507562, 0.74447350, 0.25552650],
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[0.25507562, 0.24447350, 0.75552650],
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[0.75507562, 0.24447350, 0.75552650],
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[0.24492438, 0.75552650, 0.74447350],
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[0.74492438, 0.75552650, 0.74447350],
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]
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symbols_NaCl222 = ["Na"] * 8 + ["Cl"] * 8
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cell_NaCl222 = PhonopyAtoms(
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cell=lattice_NaCl222, scaled_positions=positions_NaCl222, symbols=symbols_NaCl222
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)
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def test_modulation(ph_nacl: Phonopy, helper_methods):
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"""Test to calculate modulation by NaCl."""
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ph = ph_nacl
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ph.set_modulations([2, 2, 2], [[[0, 0.5, 0.5], 1, 2, 0]])
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cells = ph.get_modulated_supercells()
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helper_methods.compare_cells_with_order(cells[0], cell_NaCl222)
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def _show(cells):
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for cell in cells:
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for p in cell.scaled_positions:
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print("[%.8f, %.8f, %.8f]," % tuple(p))
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