You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: nrtIpbHelmholtz.m
    path of file: ./repos/Swan/gypsilabModified/nonRegressionTest/inverseProblem
    
    the code of the file until where you have to start completion: %+========================================================================+
%|               
    
function --> G(x,y) = exp(ik|x-y|)/|x-y| 
Gxy = @(X,Y) femGreenKernel(X,Y,'[exp(ikr)/r]',k);

% grady Green kernel function --> G(x,y) = grady[exp(ik|x-y|)/|x-y|]
dyGxy{1} = @(X,Y) femGreenKernel(X,Y,'grady[exp(ikr)/r]1',k);
dyGxy{2} = @(X,Y) femGreenKernel(X,Y,'grady[exp(ikr)/r]2',k);
dyGxy{3} = @(X,Y) femGreenKernel(X,Y,'grady[exp(ikr)/r]3',k);

% Green kernel function --> G(x,y) = gradx[exp(ik|x-y|)/|x-y|]
dxGxy{1} = @(X,Y) femGreenKernel(X,Y,'gradx[exp(ikr)/r]1',k);
dxGxy{2} = @(X,Y) femGreenKernel(X,Y,'gradx[exp(ikr)/r]2',k);
dxGxy{3} = @(X,Y) femGreenKernel(X,Y,'gradx[exp(ikr)/r]3',k);

% Finite element
gss = 3;
typ = 'P1';
tol = 1e-3;


%%%%%%%%%%%%%%%%%%%%%%%%%%%%% SCATERING PROBLEM %%%%%%%%%%%%%%%%%%%%%%%%%%%
% Fictive mesh for diffraction problem (sphere)
mesh = mshSphere(4e2,1);

% % Fictive mesh for diffraction problem (cube)
% mesh = mshCube(4e2,[1 1 1]);
% mesh = mesh.bnd;

% Verify wave number
stp = mesh.stp;
if k > 1/stp(2)
    error('completionHelmholtz.m : wave number k is too high for mesh')
end