How do I copy fields name and their contents to another struct variable?

Lets say that I have this code:

a=struct;
a(1).a='a1';
a(1).b='b1';
a(1).c='c1';

a(2).a='a1';
a(2).b='b1';
a(2).c='c1';

a(3).a='a1';
a(3).b='b1';
a(3).c='c1';

Now, I want to copy only a(2) to b(1) with its all fields. for example:

b=struct;
b(1)=a(2);
b(2)=a(3);

How can I do that?

Answer 1

[Jos (10584)]

a(1).x = 1
a(2).x = 2
a(3).x = 3

b(1:2) = a(2:3) % Is this what you want? b(1) now equals a(2) ...

[ELI]

If I do that, I get error:

Subscripted assignment between dissimilar structures.

[Jess]

What version of MATLAB are you using? The following works for me in 8.4.0.150421 (R2014b):

 a=struct; 
 a(1).a='a1';
 a(1).b='b1';
 a(1).c='c1';
 a(2).a='a2';
 a(2).b='b2';
 a(2).c='c2';
 a(3).a='a3';
 a(3).b='b3';
 a(3).c='c3';

 b(1:2) = a(2:3)

(Note that I changed the values slightly.)

Perhaps instead of

 a(1).x = 1 
 a(2).x = 2 
 a(3).x = 3

you should write out x:

 a(1).a = 1 
 a(2).a = 2 
 a(3).a = 3

It sounds like you're storing one thing in another wrong.