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ilkayisik/square_matrix_from_vector.py

Last active February 19, 2021 10:40
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two ways of making a square matrix from a vector
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square_matrix_from_vector.py
'''make square matrix from vector'''
import numpy as np
nr_elems = 253
vals = np.random.rand(nr_elems)
# first method using scipy distance:
from scipy.spatial import distance
vals_square_1 = distance.squareform(vals)
# second method using numpy
vals_square_2 = np.zeros([23, 23])
vals_square_2[np.triu_indices(len(vals_square_2), k=1)] = vals
vals_square_2 = vals_square_2 + vals_square_2.T
np.all(vals_square_1 == vals_square_2)
as_matrix = spatial.distance.squareform(Y, force='tomatrix', checks=False)
# return upper part of a square matrix:
M[np.triu_indices(len(M), k=k)]
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