linprog example returns empty vector (when it should return 0.6667 1.3333)

Question

Hao Sun 2020-2-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508067-linprog-example-returns-empty-vector-when-it-should-return-0-6667-1-3333

编辑： Stephen23 2020-2-29

Running this example https://www.mathworks.com/help/optim/ug/linprog.html#buus0qo-2

just gives me x =[] what gives I should be getting

Optimal solution found.

x = 2×1

0.6667

1.3333

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John D'Errico 2020-2-28

How to get rid of it? Um, you created a file with that name, then saved it on your search path. Don't do that?

It is legal to delete or rename a file that you created.

In general, it is a bad idea to create files with the same name as MATLAB functions that you will later be using. Else, you will have this exact problem.

Hao Sun 2020-2-29

I don't think I created that file I think it just got installed when I installed certain matlab packages or something. Btw if I cannot delete the file directly ( I don't have administrative access I use matlab on campus as a student) what can I do? Also what can I do to prevent overriding these defaults when installing packages?

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Answer 1

Stephen23 2020-2-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508067-linprog-example-returns-empty-vector-when-it-should-return-0-6667-1-3333#answer_417849

编辑：Stephen23 2020-2-29

"...I think it just got installed when I installed certain matlab packages or something."

It looks like some badly-written third-party toolboxes are shadowing the inbuilt function name/s.

" Also what can I do to prevent overriding these defaults when installing packages?"

You could:

delete those toolboxes (but usually users want to keep toolboxes), or
rename those functions (this might not be a trivial task), or
change the path order so that inbuilt toolboxes have a higher priority (but this could break functionality of those badly-written third-party toolboxes), or
remove those toolboxes from the Search Path:

https://www.mathworks.com/help/matlab/matlab_env/what-is-the-matlab-search-path.html

For example, you could use restoredefaultpath to reset back to the default Search Path:

https://www.mathworks.com/help/matlab/ref/restoredefaultpath.html