Creating variable whose name is part of a string

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Dina Irofti
Dina Irofti 2013-6-13
I have a .mat file as an input for my function and I know that it contains a struct, but I don't know exactly the name of that struct (is different from file to file).
>> s = load('myFile');
>> name = fieldnames(s)
name =
unknown
where unknown depends on the .mat file input I have.
How can I access s.unknown.X? (I know for sure that unknown have an X and Y field, whatever the input might be)

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采纳的回答

Robert Cumming
Robert Cumming 2013-6-13
see this question
Basically - dont use eval - its bad! use dynamic fieldnames instead! :)
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Jan
Jan 2013-6-13
I agree with Robert: Do not create variables dynamically. It would work, but increase the complexity of the code without any real benefit, slows down Matlab by impeding the JIT acceleration, and makes debugging much harder.
Dina Irofti
Dina Irofti 2013-6-13
You are right, it is better to use dynamic fieldnames. My solution is:
s = load('myFile');
unknown = fieldnames(s);
unknown = unknown{1};
Now I can access
s.(unknown).X

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更多回答（1 个）

Vishal Rane
Vishal Rane 2013-6-13
You could try this:
eval([name, ' = 10'])

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