neurolib - convert brain matrix from LRLR to LLRR ordering

neurolib_brain_matrix_lrlr_to_llrr_reorder.py

import numpy as np
plt.rcParams['image.cmap'] = 'plasma'
import matplotlib.pyplot as plt
from neurolib.utils.loadData import Dataset
ds = Dataset("hcp")

mat_orig = ds.Cmats[0]

N = mat_orig.shape[0]

# mapping from LRLR ordering to LLRR
lrlr_to_llrr_idx = np.hstack((np.arange(0, N, step=2), np.arange(1, N, step=2)))

mat = mat_orig
mat = mat[lrlr_to_llrr_idx]
mat = mat.T
mat = mat[lrlr_to_llrr_idx]
mat = mat.T

fig, axs = plt.subplots(1, 2, figsize=(8, 4), dpi=75)
axs[0].set_title("LRLR ordering")
axs[0].imshow(mat_orig)
axs[1].set_title("LLRR ordering")
axs[1].imshow(mat)