HH_Param_Multi_Layer() and MKZ_Param_Multi_Layer() cannot load a one-layer parameter file, including one written by save_txt() #86

import tempfile

import numpy as np

from PySeismoSoil.class_parameters import HH_Param_Multi_Layer, MKZ_Param_Multi_Layer

one_layer_HH = np.genfromtxt('tests/files/HH_X_FKSH14.txt')[:, :1]  # shape (9, 1)
one_layer_H4 = np.genfromtxt('tests/files/H4_G_IWTH04.txt')[:, :1]  # shape (4, 1)

with tempfile.TemporaryDirectory() as tmp_dir:
    for param_class, array in [
        (HH_Param_Multi_Layer, one_layer_HH),
        (MKZ_Param_Multi_Layer, one_layer_H4),
    ]:
        param = param_class(array)  # loading the 2D array works
        print(param.n_layer)
        file_name = f'{tmp_dir}/params.txt'
        param.save_txt(file_name)
        print(np.genfromtxt(file_name).shape)
        try:
            param_class(file_name)
        except TypeError as e:
            print(f'TypeError: {e}')
# 1
# (9,)
# TypeError: `params` needs to be a 2D numpy array.
# 1
# (4,)
# TypeError: `params` needs to be a 2D numpy array.
# (expected: both files load back with n_layer == 1)