How to create a variable named from string

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Kasper Buchardt 2020-12-3

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评论： Ameer Hamza 2020-12-3

I'm loading data from an excel file, with multiple objects. I want to create a variable (matrix) named after the object, containing processed data.

So this is basically what I have:

test_data.name(i) = 'Object 2-1'

This is what i want:

Object_2_1 = [3 4 5 etc.];

This means i both needs to replace "space" and "-" with "_" and then name/create the variable. Can someone please help me on how to approach this challenge?

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Stephen23 2020-12-3

You can also refer to this page: https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

which states "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended. The preferred method is to store related data in a single array."

and also this page, which gives plenty of reaons why this approach to writing code should be avoided:

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

Kasper Buchardt 2020-12-3

Thank you both very much, both @Deepak for providing a possible answer to my question and to @Stephen for guidance towards another solution which is more correct.

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Ameer Hamza 2020-12-3

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Although possible, it is a terrible (cannot emphasize enough) coding practice to create variable names dynamically: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval. Avoid it. Either use struct, tables or arrays. It will make your code much efficient and easy to debug.

For example, you can use the test_data struct to contain names as well as data.

test_data(i).name = 'Object 2-1';
test_data(i).data = [3 4 5 etc.];

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Kasper Buchardt 2020-12-3

That sounds very interresting and is definitly something i will look into and experiment with.

Thank you yet again.

Ameer Hamza 2020-12-3

I am glad to be of help! :)

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MATLAB Language Fundamentals Entering Commands

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