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: Index_vssa.m
    path of file: ./repos/StiffMa/tbx/StiffMa/Vector
    
    the code of the file until where you have to start completion: function [iK, jK] = Index_vssa(elements, sets)
% INDEX_VSSA Compute the row/column indices of tril(K) in a vector (v) problem
% using SERIAL (s) computing and symmety (s) to return ALL (a) indices for the mesh.
%   INDEX_VSSA(elements, sets) returns the rows "iK" and columns "jK"
%   position of all element stiffness matrices in the global system for a
%   finite element analysis of a vector problem in a three-dimensional
%   domain taking advantage of symmetry, where "elements" is the
%   connectivity matrix. The struct "sets" must contain several similation
%   parameters:
%   - sets.dTE is the data precision of "Mesh.elements"
%   - sets.nel is the number of finite elements
%   - sets.edof is the number of DOFs per element
%   - sets.sz  is the umber of symmetry entries.
%
%   See also STIFFMA_VSS
%
%   For more information, see the <a href="matlab:
%   web('https://github.com/fjramireg/StiffMa')">StiffMa</a> web site.

%   Written by Francisco Javier Ramirez-Gil, fjramireg@gmail.com
%   Universidad Nacional de Colombia - Medellin
% 	Modified: 28/01/2020. Version: 1.4. Name changed, Doc improved
% 	Modified: 28/01/2019. Version: 1.3
%   Created:  16/01/2019. Version: 1.0

iK = zeros(sets.sz*sets.nel, 1, sets.dTE);   % Stores row indices
jK = zeros(sets.sz*sets.nel, 1, sets.dTE);   % Stores column indices
for e = 1:sets.nel
    n = elements(e,:);
    dof = [3*n-2; 3*n-1; 3*n];
    temp = 0;
    for j = 1:sets.edof
        for i = j:sets.edof
            idx = temp + i + sets.sz*(e-1);
            if dof(i) >= dof(j)
                iK(idx) = dof(i);

    
function [iK, jK] = Index_vssa(elements, sets)
% INDEX_VSSA Compute the row/column indices of tril(K) in a vector (v) problem
% using SERIAL (s) computing and symmety (s) to return ALL (a) indices for the mesh.
%   INDEX_VSSA(elements, sets) returns the rows "iK" and columns "jK"
%   position of all element stiffness matrices in the global system for a
%   finite element analysis of a vector problem in a three-dimensional
%   domain taking advantage of symmetry, where "elements" is the
%   connectivity matrix. The struct "sets" must contain several similation
%   parameters:
%   - sets.dTE is the data precision of "Mesh.elements"
%   - sets.nel is the number of finite elements
%   - sets.edof is the number of DOFs per element
%   - sets.sz  is the umber of symmetry entries.
%
%   See also STIFFMA_VSS
%
%   For more information, see the <a href="matlab:
%   web('https://github.com/fjramireg/StiffMa')">StiffMa</a> web site.

%   Written by Francisco Javier Ramirez-Gil, fjramireg@gmail.com
%   Universidad Nacional de Colombia - Medellin
% 	Modified: 28/01/2020. Version: 1.4. Name changed, Doc improved
% 	Modified: 28/01/2019. Version: 1.3
%   Created:  16/01/2019. Version: 1.0

iK = zeros(sets.sz*sets.nel, 1, sets.dTE);   % Stores row indices
jK = zeros(sets.sz*sets.nel, 1, sets.dTE);   % Stores column indices
for e = 1:sets.nel
    n = elements(e,:);
    dof = [3*n-2; 3*n-1; 3*n];
    temp = 0;
    for j = 1:sets.edof
        for i = j:sets.edof
            idx = temp + i + sets.sz*(e-1);
            if dof(i) >= dof(j)
                iK(idx) = dof(i);
                jK(idx) = dof(j);
            else
                iK(idx) = dof(j);
                jK(idx) = dof(i);
            end