Hello, 

I am trying to solve a least cost energy optimization model using CPLEX. I would like to use the barrier optimizer with no crossover, but when I run the solver I get the following error: CPLEX Error 1262: No basis exists. The CPLEX parameters I am using are:

name: cplex
threads: 4
lpmethod: 4 # barrier
solutiontype: 2 # non basic solution, ie no crossover
barrier.convergetol: 1.e-5
feasopt.tolerance: 1.e-6

I do not understand why CPLEX needs a basis in this case. How can I avoid getting this error? Thank you in advance!

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Kind regards,

Marissa Moultak
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#DecisionOptimization

This indeed looks odd. But it is unclear where this error comes from. Could you please explain in more detail what exactly you are doing? Are you solving with the interactive or with some programming API? What exactly is the line of code that throws the error? Can you show a backtrace?

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Daniel Junglas
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Hi Daniel, 

Thank you for the quick response. My apologies that the explanation of the problem was not more explicit. I am using a Python program and there was a bug in the system that I was luckily able to get fixed. Thank you for your help! 

Best,

------------------------------
Kind regards,

Marissa Moultak
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Original Message:
Sent: Thu June 04, 2020 02:29 AM
From: Daniel Junglas
Subject: CPLEX Error 1262: No basis exists.

This indeed looks odd. But it is unclear where this error comes from. Could you please explain in more detail what exactly you are doing? Are you solving with the interactive or with some programming API? What exactly is the line of code that throws the error? Can you show a backtrace?

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Daniel Junglas
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Is problem fixed now

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nicek raba
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Original Message:
Sent: Wed June 10, 2020 02:34 PM
From: Marissa Moultak
Subject: CPLEX Error 1262: No basis exists.

Hi Daniel, 

Thank you for the quick response. My apologies that the explanation of the problem was not more explicit. I am using a Python program and there was a bug in the system that I was luckily able to get fixed. Thank you for your help! 

Best,

------------------------------
Kind regards,

Marissa Moultak
------------------------------


Original Message:
Sent: Thu June 04, 2020 02:29 AM
From: Daniel Junglas
Subject: CPLEX Error 1262: No basis exists.

This indeed looks odd. But it is unclear where this error comes from. Could you please explain in more detail what exactly you are doing? Are you solving with the interactive or with some programming API? What exactly is the line of code that throws the error? Can you show a backtrace?

------------------------------
Daniel Junglas