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: stts.m
    path of file: ./repos/hctsa/Toolboxes/OpenTSTOOL/tstoolbox/@signal
    
    the code of the file until where you have to start completion: function rs = stts(s, I, J, K, L)

    
function rs = stts(s, I, J, K, L)

%tstoolbox/@signal/stts
%   Syntax:
%     * rs = stts(s, I) (J=0, K=1, L=1)
%     * rs = stts(s, I, J) (K=1, L=1)
%     * rs = stts(s, I, J, K) (L=1)
%     * rs = stts(s, I, J, K, L)
%
%   Input Arguments:
%     * s - input data set of N snapshots of length M, given as N by M
%       matrix
%     * I - number of spatial neighbours
%     * J - number of temporal neighbours (in the past)
%     * K - spatial shift (= spatial delay)
%     * L - temporal delay
%
%   Spatiotemporal prediction conforming to U. Parlitz, NONLINEAR
%   TIME-SERIES ANALYSIS Chapter 1.10.2.1.
%
% Copyright 1997-2001 DPI Goettingen, License http://www.physik3.gwdg.de/tstool/gpl.txt

narginchk(2,5);

if nargin < 3, J = 0; end