TypeError: unsupported operand type(s) for @: 'MVar' and 'numpy.float64'

Awaiting user input

Victor Chen

January 24, 2023 20:50

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I got the following error, and it seems something is incompatible with '@' as the operand. Can someone help?

TypeError: unsupported operand type(s) for @: 'MVar' and 'numpy.float64'

Related to

• Python
• Matrix API

0

• Official comment

  

  Simranjit Kaur

  • Gurobi Staff

  November 13, 2026 01:49

  This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
• 

  Simon Bowly

  • Gurobi Staff

  January 25, 2023 01:31

  Hi Victor,

  Could you please post a minimal, reproducible example? This must include how all variables and data in your code are created so that we can reproduce the error and point to the issue.

  An educated guess based on the error message: one of the terms on the "objective =" line is a scalar (a numpy.float64 type) not an array, which is required for the matrix multiplication operator "@". However, I cannot tell which term is causing the error without knowing what each object is in your python code.

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