Merge pull request #91 from ywx649999311/iss89

Iss89

.gitignore

@@ -1,3 +1,6 @@
+# mac
+*.DS_STORE
+
 # dev folder
 /dev/*
 !/dev/00_template.ipynb

src/eztao/carma/CARMATerm.py

@@ -374,6 +374,12 @@ def get_rms_amp(self):
         log_pars = self.get_parameter_vector()
         return self.rms_amp(log_pars[: self.p], log_pars[self.p :])
 
+    def get_carma_parameter(self):
+        """Return CARMA parameters in the natural sacle."""
+
+        log_pars = self.get_parameter_vector()
+        return _compute_exp(log_pars)
+
     @staticmethod
     def rms_amp(log_arpars, log_mapars):
         """Compute the RMS amplitude of a CARMA kernel

tests/test_CARMATerm.py

@@ -112,3 +112,15 @@ def test_carma_fcoeffs():
     with pytest.deprecated_call():
         params = np.append(*kernel1.fcoeffs2carma(np.log(fcoeffs), 3))
     assert np.allclose(np.log(params), kernel1.get_parameter_vector())
+
+
+def test_carma_get_parameters():
+    """Test the method CARMA_term.get_carma_parameter."""
+    input_ar = [3, 2.8, 0.8]
+    input_ma = [1, 5]
+    kernel1 = CARMA_term(np.log(input_ar), np.log(input_ma))
+
+    # test the equality of two functions
+    assert np.allclose(
+        np.exp(kernel1.get_parameter_vector()), kernel1.get_carma_parameter()
+    )