Re: Automatically Combining Structures

[Przemek Klosowski]

Bill asked
   Is there a way to automatically combine structures?  What I'm wanting to 
   do is something like:

   a.c = 1;
   a.d = 2;
   b.e = 3;
   b.f = 4;
   g = combine(a, b)

   g =
   {
     c = 1
     d = 2
     e = 3
     f = 4
   }

I thought something like this would work:

function s=combine(varargin)
 for a = varargin{:}
  for [v,n]=a
   s.n=v;
  endfor
 endfor
endfunction

but I get an error in the first 'for'---you can't iterate like
that. OK. so I thought this might work:

function s=combine(varargin)
 for i=1:nargin
   a=varargin{i}
   for [v,n]=a
     s.n=v
   endfor
 endfor
endfunction

but it doesn't substitute the _value_ of n, but rather
just sets s.n, so we need eval to the rescue:

function s=combine(varargin)
 for i=1:nargin
   a=varargin{i}
   for [v,n]=a
     eval(strcat("s.",n,"=v"))
   endfor
 endfor
endfunction


So, is there a simpler way to write it?