Problem interpreting Matlab code

[Terry Duell]

Hullo All,
I am trying to port some Matlab code to Octave, and have a problem that is  
a bit beyond my knowledge.

The original Matlab code
--------------------
% conjugate gradient
x = minres(@compute_Ax_kernelEst,b(:),1e-4,maxiters,[],[],K(:),ang,  
stdnoise,filts, h, w, numSampOrientation);
...
function Ax = compute_Ax_kernelEst(K,ang, stdnoise,filts, h, w,  
numSampOrientation)
-------------------
I found a minres function, which, on the surface looked pretty much like  
the Matlab minres doc description;
function [x,flag,relres,itn,resvec] =  minres(A,b,rtol,maxit)

but this all caused Octave to throw an error re the function handle being  
passed to minres.
I have tried to interpret how to best implement this in Octave and tried  
the following;

%TLD changes to avoid passing handle to minres
ATLDx = compute_Ax_kernelEst(K(:),ang, stdnoise,filts, h, w,  
numSampOrientation);
% conjugate gradient
%was x = minres(@compute_Ax_kernelEst,b(:),1e-4,maxiters,[],[],K(:),ang,  
stdnoise,filts, h, w, numSampOrientation);
[x,flag,relres,itn,resvec] = minres(ATLDx,b(:),1e-4,maxiters);

but this now causes errors in minres.
Can anyone please say if my work-around to avoid passing the function  
handle makes sense?
Of course there may be other issues with the minres code, but at this  
stage I'm not sure where I should be looking for the problem.

Cheers,
--
Regards,
Terry Duell