passing a structure to fsolve

[altomare]

Hi all,

I would like to pass a structure to fsolve but so far I did not have any
luck
Minimal example:
%%
clear all

function r = gtest(str)
r=str.a-str.b;
endfunction
test.a=2;
test.b=3;


If I type: gtest(test) I get 
ans = -1
However 
[x, fval, info] = fsolve (@(var) gtest(var),test)
returns:
error: Invalid call to fsolve.  Correct usage is: ...
It looks to me that I cannot pass a structure to fsolve. If that is the
case, how can I circumvent the problem? Passing two variables? Can someone
provide a minimal example?
I was looking at a structure because I have 
struc(i,j).a struc(i,j).b struc(i,j).c struc(i,j).d which, for each i and j,
have dimension 1.
However I also need to pass struc(i,j).e which is a vector.
Any help is appreciated.
Thanks
fabio 



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