Python _make_edges Examples

Example #1

File: mickey.py Project: alexis-roche/scripts

def make_laplacian(mask):
    edges = _make_edges(mask_to_idx(mask), NGB_SIZE)
    n = edges.max() + 1
    neg_weights = -np.ones(edges.shape[0])
    L = sparse.coo_matrix((neg_weights, edges.T), shape=(n, n))
    diag = np.vstack((np.arange(n), np.arange(n)))
    degrees = -np.ravel(L.sum(axis=1))
    return sparse.coo_matrix((np.hstack((neg_weights, degrees)),
                              np.hstack((edges.T, diag))),
                             shape=(n, n))

Example #2

File: test_rw.py Project: alexis-roche/scripts

import numpy as np

from nipy.algorithms.segmentation._segmentation import _make_edges



im = np.random.rand(5, 4, 7)
msk = (im > .5).astype('uint')

edges = _make_edges(msk, 6)