Open data in File as per user input

2024 10 1
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Hello, I am trying to get input from user to load a file and then ask which variable from the file would they like to plot. The input file will be a .mat file and it is a 1x1 struct file with various 2 double series data in it.
When I run this, the error says: Unrecognized field name "x"
Here is my code:
filename=input('Input File Name \n','s');
file = load(filename);
x=string(input('Variable? \n','s'));
plot(file.x)

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