Variable importing into code

Question

Matt Brianik 2018-1-11

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https://ww2.mathworks.cn/matlabcentral/answers/376716-variable-importing-into-code

评论： Guillaume 2018-1-12

Is there a way to import variables from work space into the code that genrrates them.

For example

x=20 random names

y=genvarname(x)

can i now import y into the code and use these variables

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Stephen23 2018-1-12

编辑：Stephen23 2018-1-12

Don't do that.

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

Use a structure, any other array (cell, ND numeric, etc) with indexing, or a table, etc.

Guillaume 2018-1-12

I think that maybe you're asking the wrong question.

As others have said, creating dynamically named variables is a bad idea (for many reasons). There are other more reliable methods such as structures with dynamic fields or better a table if all these variables are the same size. And we can show you how to do that if that's indeed what you need to do.

However, the fact that you want to do this is puzzling. So what's your use case? It may be that you're approaching this completely the wrong way and a completely different approach would solve your problem more easily.

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Answer 1

Star Strider 2018-1-11

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I would import ‘y’ as an array of some type (numeric, cell, table, etc.) and refer to the individual elements in your calculations. Dynamic variable creation is not considered good programming practice.

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Answer 2

SRT HellKitty 2018-1-11

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I think this is the answer that you are looking for. Basically you can use evalin or assignin to do this and I cannot think of a better way this can be done unless there is a more elegant solution using get_param/getVariable. It is not recommended to use evalin and assignin for the reasons listed in This FAQ page. So if this can be avoided, that would be best otherwise this should get the job done!