Creating variable whose name is part of a string

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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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Answer 1

Robert Cumming 2013-6-13

2 个投票

see this question

Basically - dont use eval - its bad! use dynamic fieldnames instead! :)

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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 2013-6-13

在 MATLAB Online 中打开

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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Answer 2

Vishal Rane 2013-6-13

在 MATLAB Online 中打开

0 个投票

You could try this:

eval([name, ' = 10'])

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Dina Irofti 2013-6-13

I'd rather didn't use eval()

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Creating variable whose name is part of a string

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