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: searchSeries.m
    path of file: ./repos/bads/search/private
    
    the code of the file until where you have to start completion: function xs = searchSeries(x,gpstruct,LB,UB,optimState,options)
%SEARCHSERIES Search step by time series prediction (UNSUPPORTED).

if nargin < 1
    xs = 'srs';
    return;
end

MeshSize = optimState.meshsize;
SearchFactor = optimState.searchfactor;

xsuccess = bsxfun(@rdivide,optimState.xsucces
    
function

gptemp.lik = @likGauss;   % Gaussian likelihood
likmu = log(TolMesh); liks2 = 1^2;
gptemp.hyp.lik = likmu;
gptemp.prior.lik = {{@delta_prior, likmu}};
% gptemp.prior.lik = {{@gaussian_prior, likmu, liks2}};

gptemp.hyp.lik = gptemp.hyp.lik(:);
gptemp.bounds.lik = {[log(TolMesh); 10]};

%% gp mean function
if 1
    gptemp.mean = @constant_mean;             % Constant mean function
    gptemp.hyp.mean = NaN;
    gptemp.prior.mean = {{@delta_prior, 0}};      % Fixed mean
else
    gptemp.mean = {@meanSum,{@meanLinear,@meanConst}};
    gptemp.hyp.mean = NaN(2,1);
    gptemp.prior.mean{1} = {@delta_prior, 0};      % Fixed prior
    gptemp.prior.mean{2} = {@delta_prior, 0};
end