the user will be asked to input number which is good but the problem is how can I make that as numbers and letters for example 2x and put it in matrix

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Dilovan Rafeeq 2021-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/853110-the-user-will-be-asked-to-input-number-which-is-good-but-the-problem-is-how-can-i-make-that-as-numb

评论： Dilovan Rafeeq 2021-6-10

A=Input ('enter the number') user add it but I need it to accept both letters and numbers

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John D'Errico 2021-6-10

2x is NOT valid as a formula/expression in MATLAB. And that means you would need to parse the input, inserting multiplication symbols as needed.

Dilovan Rafeeq 2021-6-10

Seems understandable but how can I do that with matlab

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Answer 1

Jan 2021-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/853110-the-user-will-be-asked-to-input-number-which-is-good-but-the-problem-is-how-can-i-make-that-as-numb#answer_721975

This is a really complicated task, which is prone to bugs. How do you want to treat "2x" compared to "x2"? If "x" is a variable, "x2" can be a variable also. Or it can mean "x * 2". There is no clear and clean way, to distinguish this. Therefore Matlab uses the * as multiplication operator and omitting it in "2x" is no valid syntax.

If you want to write a really intelligent parser, make sure to publish the results as PhD or sell it at least to Google for their AI resarch.

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