Add the matrix_vector module with only the isomorphism() function for now.

[sage.d.git] / mjo / cone / symmetric_psd.py

diff --git a/mjo/cone/symmetric_psd.py b/mjo/cone/symmetric_psd.py
index d85ac247e12ca2a4936851182081415bba688061..c9f2a4df4ac87ffca9e44a956516af794a934ee7 100644 (file)
--- a/mjo/cone/symmetric_psd.py
+++ b/mjo/cone/symmetric_psd.py
@@ -22,7 +22,7 @@ def is_symmetric_psd(A):
 
     INPUT:
 
-      - ``A`` - The matrix in question
+    - ``A`` - The matrix in question
 
     OUTPUT:
 
@@ -74,7 +74,7 @@ def unit_eigenvectors(A):
 
     INPUT:
 
-      - ``A`` - The matrix whose eigenvectors we want to compute.
+    - ``A`` - The matrix whose eigenvectors we want to compute.
 
     OUTPUT:
 
@@ -178,14 +178,15 @@ def factor_psd(A):
     """
 
     if not A.base_ring().is_exact() and not A.base_ring() is SR:
-        raise ValueError('The base ring of ``A`` must be either exact or symbolic.')
+        msg = 'The base ring of ``A`` must be either exact or symbolic.'
+        raise ValueError(msg)
 
     if not A.base_ring().is_field():
         raise ValueError('The base ring of ``A`` must be a field.')
 
     if not A.base_ring() is SR:
         # Change the base field of ``A`` so that we are sure we can take
-        # roots. The symbolic ring has no algebraic closure.
+        # roots. The symbolic ring has no algebraic_closure method.
         A = A.change_ring(A.base_ring().algebraic_closure())