fix latex representation for exp format and multi-digit exponents of s or z (#330)

bnavigator · murrayrm · commit fe6d77427764 · 2019-12-31T14:07:23.000-08:00
* fix latex representation for exponential format and multi-digit exponents of s or z

* add docstring to _tf__string_to_latex

* move to times instead of cdot

* add unittest

* fix invalid escape sequence

* more invalid escape sequences
diff --git a/control/tests/xferfcn_test.py b/control/tests/xferfcn_test.py
@@ -496,7 +496,6 @@ def test_freqresp_mimo(self):
         np.testing.assert_array_equal(omega, true_omega)
 
     # Tests for TransferFunction.pole and TransferFunction.zero.
-
     def test_common_den(self):
         """ Test the helper function to compute common denomitators."""
 
