Undefined function or variable 'Screen'

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Weiling Lee 2017-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/353443-undefined-function-or-variable-screen

回答： Steven Lord 2017-8-21

Hi,

I'm getting some errors and I'm not too sure what it means.

Will be grateful for any help to resolve this error. Thank you.

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KSSV 2017-8-21

There is no inbuilt function called Screen in matlab...

Adam 2017-8-21

If it is your own class or function you just need to add it to your path, but you didn't give us any information as to what 'Screen' is supposed to be or what you expect. The error message is very clear.

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Steven Lord 2017-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/353443-undefined-function-or-variable-screen#answer_278692

I suspect you're trying to use the third-party Psychophysics Toolbox but you have not installed that toolbox. If that's the case, see the installation instructions on the Downloads section of the Psychtoolbox website I linked above.