Hello Everyone, 

I am currently working on Cplex using Python API. I have a problem when I run 
the code. I keep getting this error about the invalid matrix input but I'm not 
able to figure out what it is. I would be grateful if any of you could help. My 
function is as below

def add_constraint(self, variables, coefficients, sense, rhs, name):
      lin_expr = [[ variables, coefficients ]],
      senses =    [sense],
      rhs =       [rhs],
      names =     [name] )

Traceback (most recent call last):
  File "RW10.py", line 569, in <module>
  File "RW10.py", line 562, in main
    solveVNEProblem( phy_network, demands, args.output)
  File "RW10.py", line 116, in solveVNEProblem
    solver.add_constraint( varNames, varCoeffs, "E", 1.0, 
"Location_Constraints1{}".format( demand.demandID ) )
  File "RW10.py", line 26, in add_constraint
    names =     [name] )
 line 1187, in add
    rmat = _C_HBMatrix(lin_expr, self._cplex._env_lp_ptr, 0, 
 line 74, in __init__
    raise TypeError(" invalid matrix input type -- ", self._mat[0])
TypeError: (' invalid matrix input type -- ', u'1')

Thank You

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