New test for matrix inverse with matrix containing floats r integers

pyerrors/pyerrors.py

@@ -345,7 +345,7 @@ class Obs:
         return np.abs(self.value) <= self.dvalue
 
     def is_zero(self):
-        np.isclose(0.0, self.value) and all(np.allclose(0.0, delta) for delta in self.deltas.values())
+        return np.isclose(0.0, self.value) and all(np.allclose(0.0, delta) for delta in self.deltas.values())
 
     def plot_tauint(self, save=None):
         """Plot integrated autocorrelation time for each ensemble."""

tests/test_linalg.py

@@ -6,6 +6,18 @@ import pytest
 np.random.seed(0)
 
 
+def test_matrix_inverse():
+    content = []
+    for t in range(9):
+        exponent = np.random.normal(3, 5)
+        content.append(pe.pseudo_Obs(2 + 10 ** exponent, 10 ** (exponent - 1), 't'))
+
+    content.append(1.0) # Add 1.0 as a float
+    matrix = np.diag(content)
+    inverse_matrix = pe.linalg.mat_mat_op(np.linalg.inv, matrix)
+    assert all([o.is_zero() for o in np.diag(matrix) * np.diag(inverse_matrix) - 1])
+
+
 def test_matrix_functions():
     dim = 3 + int(4 * np.random.rand())
     print(dim)