Interchange variable names and strings

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Timothy Cale 2012-2-21

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编辑： Asl 2013-10-21

How do I convert a string to a variable name (and vice versa)?

I want to read in a string, and use it as a variable name, such as when I load a *.mat, in which the variable names depend upon which program generated/saved the *.mat.

I can see it useful to convert a variable name to a string.

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Answer 1

Walter Roberson 2012-2-21

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在 MATLAB Online 中打开

<http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

Consider using

S = load('YourMATFile.mat');
the_var_names = fieldnames(S);
second_var = S.(the_var_names{2});

You can slice, dice, trice, even julienne!

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Timothy Cale 2012-2-23

Walter:

Thanks, your suggestion can be used to do what I need; i.e., to be able to load saved *.mat data into a program for which the variable names differ from those used in the saving program.

I use the form:

save('name','var1','var2' . . . . )

And as long as var1 is a variable name in the loading program, all is good.

What I "really" want to do is let the loading program read the names of the variables used in the saving program . . . But I can use the order of storage, as you suggest.

Walter Roberson 2012-2-23

the_var_names in the above code would contain the variable names.

I just pulled out the second one as an example to show how you can get at the data.

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Answer 2

Doug Hull 2012-2-21

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We need more details on what you are doing, but this is likely a bad idea. Your code is going to be very difficult to write like this, and you will be fighting MATLAB along the way quite a bit.

There are probably better ways of doing this than allowing users to define the internal variable names to your program. You would need to validate the names, write your code to handle unknown variable names, etc. There is likely a better way.