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: sw_test_sw1.m
    path of file: ./repos/spinw/test
    
    the code of the file until where you have to start completion: function [Res, errMsg] = sw_test_sw1(tol)
% check spin wave calculation (spinwave routine)

Res = 0;
errMsg = [];

try
    
    %% define crystal structure of
    
function Na2IrO3fun(obj, Jinp)
% takes the values as [J1 J2 J3 JK] and put them into the Hamiltonian

J1 = Jinp(1);
J2 = Jinp(2);
J3 = Jinp(3);
JK = Jinp(4);

JKxx=zeros(3); JKxx(1,1)=-JK;
JKyy=zeros(3); JKyy(2,2)=-JK;
JKzz=zeros(3); JKzz(3,3)=-JK;

obj.matrix.mat = cat(3,JKxx,JKyy,JKzz,eye(3)*J1,eye(3)*J2,eye(3)*J3);

end