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

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

Answer 1

[James Tursa]

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

output = myStruct.(freq);

[Andy Garcia Barrabeitg]

Thank you, that seemed to take the name, but for some reason it still can't find the value?

>> [output] = myFunction('delta')
'Unable to resolve the name myStruct.delta.
'Error in myFunction (line 2)
'output = myStruct.(freq); 
>> myStruct.delta
ans =
     1

[James Tursa]

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]

Ah okay, thank you James!