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: initializeMovie.m
    path of file: ./repos/chebfun/@spinop
    
    the code of the file until where you have to start completion: function [p, opts] = initializeMovie(S, dt, pref, v, compGrid, plotGrid)
%INITIALIZEMOVIE   Initialize a movie when solving a PDE specified by a SPINOP.

% Copyright 2017 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information.

% Note: P is a NVARSx2 CELL-ARRAY that stores the NVARS plots in the first 
% row, and the NVARS titles in the second row. OPTS is a 2x1 CELL-ARRAY that 
% stores the limits of the y-axis in OPTS{1} and what kind of data to plot in 
% OPTS{2} (real/imag/abs; when the data is complex-valued).

% Set-up:
dom = S.domain;                       % Spatial domain
nVars = S.numVars;                    % Number of variables (>1 for systems)
vscale = max(abs(v));                 % Scale of the solution 
dataplot = str2func(pref.dataplot);   % Plot 'abs', 'real' or 'imag'
xx = compGrid{1};                     % Computation grid

    
function [p, opts] = initializeMovie(S, dt, pref, v, compGrid, plotGrid)
%INITIALIZEMOVIE   Initialize a movie when solving a PDE specified by a SPINOP.

% Copyright 2017 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information.

% Note: P is a NVARSx2 CELL-ARRAY that stores the NVARS plots in the first 
% row, and the NVARS titles in the second row. OPTS is a 2x1 CELL-ARRAY that 
% stores the limits of the y-axis in OPTS{1} and what kind of data to plot in 
% OPTS{2} (real/imag/abs; when the data is complex-valued).

% Set-up:
dom = S.domain;                       % Spatial domain
nVars = S.numVars;                    % Number of variables (>1 for systems)
vscale = max(abs(v));                 % Scale of the solution 
dataplot = str2func(pref.dataplot);   % Plot 'abs', 'real' or 'imag'
xx = compGrid{1};                     % Computation grid
xxx = plotGrid{1};                    % Movie grid
N = size(xx, 1) - 1;                  % Size of computation grid
Nplot = size(xxx, 1) - 1;             % Size of movie grid 
FS = 'fontsize'; fs = 12;             % Fontsize for title 

% Loop over the variables:
p = cell(2, nVars); clf reset
for k = 1:nVars
    
    % Extract each variable:
    idx = (k-1)*N + 1;
    vv = dataplot(v(idx:idx+N-1));
    vv = [vv; vv(1)]; %#ok<*AGROW> add repeated values (periodic end