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Fix LOBPCG Sakurai typos #776

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Merged
merged 7 commits into from
Jul 8, 2024
Merged

Fix LOBPCG Sakurai typos #776

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31f9e2d
Fix LOBPCG Sakurai typos
jarrodmillman Jul 5, 2024
12a2f99
Apply suggestions from code review
jarrodmillman Jul 5, 2024
f47cbcc
Fix direct solve
stefanv Jul 5, 2024
f91703c
Make pyamg example run
stefanv Jul 5, 2024
1e6fc64
Calculate smallest eigenvalues
stefanv Jul 5, 2024
14d4038
Fix formatting
jarrodmillman Jul 8, 2024
f58617e
Increase number of iterations to improve accuracy
jarrodmillman Jul 8, 2024
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8 changes: 4 additions & 4 deletions advanced/scipy_sparse/examples/lobpcg_sakurai.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ def sakurai(n):
"""

A = sp.sparse.eye(n, n)
d0 = np.array(r_[5, 6 * ones(n - 2), 5])
d0 = np.r_[5, 6 * np.ones(n - 2), 5]
d1 = -4 * np.ones(n)
d2 = np.ones(n)
B = sp.sparse.spdiags([d2, d1, d0, d1, d2], [-2, -1, 0, 1, 2], n, n)
Expand All @@ -41,13 +41,13 @@ def sakurai(n):
#
n = 2500
A, B, w_ex = sakurai(n) # Mikota pair
X = np.rand(n, m)
X = np.random.rand(n, m)
data = []
tt = time.clock()
tt = time.process_time()
eigs, vecs, resnh = sp.sparse.linalg.lobpcg(
A, X, B, tol=1e-6, maxiter=500, retResidualNormsHistory=1
)
data.append(time.clock() - tt)
data.append(time.process_time() - tt)
print("Results by LOBPCG for n=" + str(n))
print()
print(eigs)
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