Backends for SemidefiniteProgram()

[Peter Mueller]

Even though I installed the optional packages csdp and dsdp in Sage 9.8, they do not seem to be available as backends for `SemidefiniteProgram()`. At any rate, calling it with `solver='csdp'` or `solver='dsdp'` results in the error message *ValueError: 'solver' should be set to 'CVXOPT', 'Matrix', a class, or None (in which case the default one is used* which does not help me further.

By the way, I would consider it useful if an instance of SemidefiniteProgram could export the program to some usable file, e.g. in SDPA sparse format. (In analogy to the` write_mps()`  method for linear programs.)

-- Peter Mueller

[Dima Pasechnik]

On Fri, 17 Feb 2023, 10:15 'Peter Mueller' via sage-support, <sage-s...@googlegroups.com> wrote:

Even though I installed the optional packages csdp and dsdp in Sage 9.8, they do not seem to be available as backends for `SemidefiniteProgram()`. At any rate, calling it with `solver='csdp'` or `solver='dsdp'` results in the error message *ValueError: 'solver' should be set to 'CVXOPT', 'Matrix', a class, or None (in which case the default one is used* which does not help me further.

well, it is certainly underdeveloped, and PRs are welcome :-)

By the way, I would consider it useful if an instance of SemidefiniteProgram could export the program to some usable file, e.g. in SDPA sparse format. (In analogy to the` write_mps()`  method for linear programs.)

-- Peter Mueller

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[Matthias Koeppe]

The way forward is via CVXpy. See https://github.com/sagemath/sage/pull/35120 (needs review); next step: https://github.com/sagemath/sage/issues/31962