CMatrix now returns sparse matrix in COO format. Update to sagnac test....

CMatrix now returns sparse matrix in COO format. Update to sagnac test. Getting different results after merging not, and numpy is also saying it is a singular matrix even though KLU solves it... more debugging to go

finesse/finesse/cmatrix.pyx

@@ -341,6 +341,17 @@ cdef class CCSMatrix(object):
                 ccol += 1
 
             print("    ({}, {}) = {}".format(ccol, self.row_idx[i], self.values[i]))
+            
+    def get_sparse_matrix(self):
+        M = []
+        ccol = -1
+        for i in range(self.__nnz):
+            if self.col_ptr[ccol+1] == i:
+                ccol += 1
+                
+            M.append((ccol, self.row_idx[i], self.values[i]))
+        
+        return M
 
     def print_rhs(self):
         print("")

finesse/finesse/simulation.py

@@ -106,7 +106,7 @@ class Simulation(object):
         int
             The number of equations describing the system.
         """
-        return len(self.__model.network.nodes) * self.Nf * self.Nh * self.Np
+        return len(self.__model.network.nodes) * len(self.__frequencies) * len(self.__HOMs) * len(self.polarisations)
 
     def nindex(self, node):
         """