how to bypass error of assume being undefined - Undefined function 'assume' for input arguments of type 'logical'

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Ross Hanna 2017-4-19

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回答： Prashant Arora 2017-4-26

Hi there. i have only just recently posted on this forum as i had an issue with getting an actual answer from "solve". i fixed this by setting my variable to real but now solve gives me two equations. one positive and one negative. i want to ignore the negative as otherwise i get the error

The number of equations exceeds the number of indeterminates. This is allowed only for polynomial systems.

how do i remove the answer of -theta-acos((H^2/1040 + 260)/H) to only get positive answers of theta and zeta?

thanks

Ross

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Answer 1

Prashant Arora 2017-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/336148-how-to-bypass-error-of-assume-being-undefined-undefined-function-assume-for-input-arguments-of-t#answer_264657

在 MATLAB Online 中打开

Hi Ross,

Do you have Symbolic Math Toolbox installed? If yes, make sure it's functions are not being shadowed. You can try using the following commands to restore default MATLAB path.