How to stick struct objects with MATLAB

Question

Suppose the next variable:

B=genvarname(strcat('B',num2str(25),''));

And B will be:

B=B25;

Now, I want covert "B25" in a struct object, so I did this:

 eval([B ' = struct([])']);

With that code I convert B25 (who is saved in "B") into a struct object.

Now, I want to save another struct object into B25, like this one:

A = 

    a1: 1
    a2: 2
    a3: 'a'

As you can see, A is a struct too.

Here is where I need your help, I don't know how to do something like this:

somefunction(B,A);

And stick B with A, like this:

B25.A=

        a1: 1
        a2: 2
        a3: 'a'

Thanks!

sebastian · Accepted Answer · 2014-06-15 17:25:14Z

1

You can go on with nasty evals and do:

eval([B '.A = A;'])

Which will work, but is really bad style and makes things worse by the time you use more and more variable names like B25.

The proper question however is, why are you using a dynamic, "numbered" variable name instead of a struct array or cell array? If you have 25 B's, things could look as easy as:

B(25).A = A; % using a struct-array

or

B{25}.A = A; % using a cell array

That's what lists in progamming languages are meant for - to avoid the need of variable names like B1, B2, etc.

answered Jun 15, 2014 at 17:25

sebastian

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Comments

tim · Accepted Answer · 2014-06-15 17:17:35Z

0

Why not simply:

A = struct('a1', 1, 'a2', 2, 'a3', 'a');

and

B = struct('a', A)

answered Jun 15, 2014 at 17:17

tim

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2 Comments

lisandrojim Over a year ago

Sorry, but that is not the answer that I need, look the question please.

tim Over a year ago

Then please post a proper question. It's absolutely unclear what you want to achieve.

lisandrojim · Accepted Answer · 2014-06-15 17:32:00Z

0

B=genvarname(strcat('B',num2str(25),''));
VaibleName='A';
Data= struct('a1', 1, 'a2', 2, 'a3', 'a');
eval([B strcat(['=struct(''',VaibleName,''', Data)'''])])

B25.A

ans = 

    a1: 1
    a2: 2
    a3: 'a'

answered Jun 15, 2014 at 17:32

lisandrojim

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