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To: python-list@python.org
From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: Unable to figure out ' invalid matrix input type -- ', u'1'
Date: Wed, 28 May 2014 15:30:40 +0100
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On 28/05/2014 13:41, varun7rs@gmail.com wrote:
> 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):
>      self.prob.linear_constraints.add(
>        lin_expr = [[ variables, coefficients ]],
>        senses =    [sense],
>        rhs =       [rhs],
>        names =     [name] )
>
>
>
> Traceback (most recent call last):
>    File "RW10.py", line 569, in <module>
>      main(sys.argv[1:])
>    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] )
>    File "/opt/ibm/ILOG/CPLEX_Studio125/cplex/python/x86-64_sles10_4.1/cplex/_internal/_subinterfaces.py", line 1187, in add
>      rmat = _C_HBMatrix(lin_expr, self._cplex._env_lp_ptr, 0, self._env.parameters.read.apiencoding.get())
>    File "/opt/ibm/ILOG/CPLEX_Studio125/cplex/python/x86-64_sles10_4.1/cplex/_internal/_matrices.py", line 74, in __init__
>      raise TypeError(" invalid matrix input type -- ", self._mat[0])
> TypeError: (' invalid matrix input type -- ', u'1')
>
>
> Thank You
>

I don't know but I'll guess that should be a letter l and not the number 1.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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