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: SimTimeSeriesIndexes_Case1.m
    path of file: ./repos/VFIToolkit-matlab/SimulateTimeSeries/InfHorz
    
    the code of the file until where you have to start completion: function SimTimeSeries=SimTimeSeriesIndexes_Case1(Policy,n_d,n_a,n_z,pi_z, simoptions)

N_a=prod(n_a);
N_z=prod(n_z);
N_d=prod(n_d);

%% Simoptions are set in the commands that call this function.

% %% Check which simoptions have been used, set all others to defaults 
% if exist('simoptions','var')==0
%     %If vfoptions is not given, just use all the defaults
%     simoptions.polindorval=1;
%     simoptions.burnin=1000;
%     simoptions.seedpoint=[ceil(N_a/2),ceil(N_z/2)];
%     simoptions.simperiods=10000;
%     simoptions.parallel=1+(gpuDeviceCount>0);
%     simoptions.verbose=0;
% else
%     %Check vfoptions for missing fields, if there are some fill them with

    
function SimTimeSeries=SimTimeSeriesIndexes_Case1(Policy,n_d,n_a,n_z,pi_z, simoptions)

N_a=prod(n_a);
N_z=prod(n_z);
N_d=prod(n_d);

%% Simoptions are set in the commands that call this function.

% %% Check which simoptions have been used, set all others to defaults 
% if exist('simoptions','var')==0
%     %If vfoptions is not given, just use all the defaults
%     simoptions.polindorval=1;
%     simoptions.burnin=1000;
%     simoptions.seedpoint=[ceil(N_a/2),ceil(N_z/2)];
%     simoptions.simperiods=10000;
%     simoptions.parallel=1+(gpuDeviceCount>0);
%     simoptions.verbose=0;
% else
%     %Check vfoptions for missing fields, if there are some fill them with
%     %the defaults
%     if ~isfield(simoptions, 'polindorval')
%         simoptions.polindorval=1;
%     end