Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/pywt/tests/test_functions.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+from __future__ import division, print_function, absolute_import
+
+from numpy.testing import assert_almost_equal, assert_allclose
+
+import pywt
+
+
+def test_centrfreq():
+    # db1 is Haar function, frequency=1
+    w = pywt.Wavelet('db1')
+    expected = 1
+    result = pywt.central_frequency(w, precision=12)
+    assert_almost_equal(result, expected, decimal=3)
+    # db2, frequency=2/3
+    w = pywt.Wavelet('db2')
+    expected = 2/3.
+    result = pywt.central_frequency(w, precision=12)
+    assert_almost_equal(result, expected)
+
+
+def test_scal2frq_scale():
+    scale = 2
+    w = pywt.Wavelet('db1')
+    expected = 1. / scale
+    result = pywt.scale2frequency(w, scale, precision=12)
+    assert_almost_equal(result, expected, decimal=3)
+
+
+def test_intwave_orthogonal():
+    w = pywt.Wavelet('db1')
+    int_psi, x = pywt.integrate_wavelet(w, precision=12)
+    ix = x < 0.5
+    # For x < 0.5, the integral is equal to x
+    assert_allclose(int_psi[ix], x[ix])
+    # For x > 0.5, the integral is equal to (1 - x)
+    # Ignore last point here, there x > 1 and something goes wrong
+    assert_allclose(int_psi[~ix][:-1], 1 - x[~ix][:-1], atol=1e-10)