some new features

.venv/lib/python3.12/site-packages/scipy/sparse/tests/test_extract.py

@@ -0,0 +1,51 @@
+"""test sparse matrix construction functions"""
+
+from numpy.testing import assert_equal
+from scipy.sparse import csr_matrix, csr_array, sparray
+
+import numpy as np
+from scipy.sparse import _extract
+
+
+class TestExtract:
+    def setup_method(self):
+        self.cases = [
+            csr_array([[1,2]]),
+            csr_array([[1,0]]),
+            csr_array([[0,0]]),
+            csr_array([[1],[2]]),
+            csr_array([[1],[0]]),
+            csr_array([[0],[0]]),
+            csr_array([[1,2],[3,4]]),
+            csr_array([[0,1],[0,0]]),
+            csr_array([[0,0],[1,0]]),
+            csr_array([[0,0],[0,0]]),
+            csr_array([[1,2,0,0,3],[4,5,0,6,7],[0,0,8,9,0]]),
+            csr_array([[1,2,0,0,3],[4,5,0,6,7],[0,0,8,9,0]]).T,
+        ]
+
+    def test_find(self):
+        for A in self.cases:
+            I,J,V = _extract.find(A)
+            B = csr_array((V,(I,J)), shape=A.shape)
+            assert_equal(A.toarray(), B.toarray())
+
+    def test_tril(self):
+        for A in self.cases:
+            B = A.toarray()
+            for k in [-3,-2,-1,0,1,2,3]:
+                assert_equal(_extract.tril(A,k=k).toarray(), np.tril(B,k=k))
+
+    def test_triu(self):
+        for A in self.cases:
+            B = A.toarray()
+            for k in [-3,-2,-1,0,1,2,3]:
+                assert_equal(_extract.triu(A,k=k).toarray(), np.triu(B,k=k))
+
+    def test_array_vs_matrix(self):
+        for A in self.cases:
+            assert isinstance(_extract.tril(A), sparray)
+            assert isinstance(_extract.triu(A), sparray)
+            M = csr_matrix(A)
+            assert not isinstance(_extract.tril(M), sparray)
+            assert not isinstance(_extract.triu(M), sparray)