how to access structure elements by a key

[Rafal Mantiuk]

Hi,

How can I access an element of the structure by its key if the key is 
given as a string. That is, having a structure:

a.a = 1;

I would like to get "1", by:

a("a")

or something similar. Actually a("a") causes an error and then assertion 
fault and octave crash on 2.1.57:

error: string type invalid as index value
octave: ../liboctave/dim-vector.h:104: int& 
dim_vector::dim_vector_rep::elem(int): Assertion `i >= 0 && i < ndims' 
failed.

I need such functionality to copy only selected elements from one 
structure to another structure while I don't really know what are the 
names (keys) of the elements in the first structure.

Thanks,

Rafal

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