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: waterfall.m
    path of file: ./repos/chebfun/@separableApprox
    
    the code of the file until where you have to start completion: function varargout = waterfall( f, varargin )
%WATERFALL   Waterfall plot of a SEPARABLEAPPROX.

    
function varargout = waterfall( f, varargin )
%WATERFALL   Waterfall plot of a SEPARABLEAPPROX.
%   WATERFALL(F) displays the waterfall plot of F.
%
%   WATERFALL(F, S) displays the column and row chebfuns of F that are used for
%   its approximation.  This is a 3D version of plot(f,S), where S is a string
%   (see PLOT).
%
%   WATERFALL(F, S, 'nslices', N) displays the first min(N,length(f)) columns
%   and rows.
%
%   WATERFALL supports passing options to the plot, similar to standard Matlab
%   plot commands. The options supported are:
%       'color':      Color of lines and markers plotted.
%       'marker':     Marker for pivot points.
%       'markersize': Size of markers plotted at pivot points.
%
%   H = WATERFALL(...) returns a handle to a waterfall plot object.
%
% See also PLOT.

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

numpts = 200;

% Empty check: 
if ( isempty(f) ) 
    h = plot( [] );
    if ( nargin > 0 )
        varargout = { h };
    end