How do I access a field from a function's input?

Question

Andy Garcia Barrabeitg 2022-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/1626310-how-do-i-access-a-field-from-a-function-s-input

评论： Andy Garcia Barrabeitg 2022-1-10

Hello, I currently have a struct with different field names "Delta", "Theta", "Beta", and "Gamma". I'd like to be able to call upon these different fields in my function based on some input "freq" (sample code below). However, whenever I try to access the field from the variable it takes the variable as a literal value "freq" instead of the input in the function and thus I get an error that it can't find myStruct.freq. Is there a way I could go around this? Thanks!

function[output] = myFunction(freq)
output = myStruct.freq
end

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Answer 1

James Tursa 2022-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/1626310-how-do-i-access-a-field-from-a-function-s-input#answer_872150

编辑：James Tursa 2022-1-10

在 MATLAB Online 中打开

Assuming you are passing in a character string for freq, use this syntax:

output = myStruct.(freq);

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James Tursa 2022-1-10

You need to pass in the myStruct variable to the function also. But, quite frankly, if that is all the function does in your actual case I wouldn't even bother with the function at all. Just use the appropriate syntax in your calling code and avoid the function all together.

Andy Garcia Barrabeitg 2022-1-10