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: pivotplot.m
    path of file: ./repos/chebfun/@chebfun2
    
    the code of the file until where you have to start completion: function varargout = pivotplot(varargin)
%PIVOTPLOT   Semilogy plot of pivot values.

    
function varargout = pivotplot(varargin)
%PIVOTPLOT   Semilogy plot of pivot values.
%   PIVOTPLOT( F ) semilogy plot related to the pivots values taken during
%   the construction of the CHEBFUN2 F.
%
%   H = PIVOTPLOT( F ) returns a handle H to the figure.
%
%   PIVOTPLOT( F, S ) allows further plotting options, such as linestyle,
%   linecolor, etc. If S contains a string 'LOGLOG', the pseudo sig will be
%   displayed on a log-log scale.

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

[varargout{1:nargout}] = pivotplot@separableApprox(varargin{:});

end