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: vl_plotframe.m
    path of file: ./repos/CS_MoCo_LAB/reconstruction/matlab/CS_LAB_matlab/utils/utils_SURF/toolbox/plotop
    
    the code of the file until where you have to start completion: function h = vl_plotframe(frames,varargin)

    
function h = vl_plotframe(frames,varargin)
% VL_PLOTFRAME  Plot a geometric frame
%  VL_PLOTFRAME(FRAME) plots the feature frame FRAME. The frame can be
%  either a 2D point, a circle, an oriented circle, an ellipse, or an
%  oriented ellipse, as follows:
%
%  Point::
%    FRAME has 2 components. FRAME(1:2) are the x,y coordinates of the
%    point.
%
%  Circle::
%    FRAME has 3 components. FRAME(1:2) are the x,y coordinates of the
%    center and FRAME(3) is its radius.
%
%  Oriented circle::
%    FRAME has 4 components. FRAME(1:2) are the x,y coordiantes of the
%    center of the circle, FRAME(3) is the radius, and FRAME(4) is the
%    orientation, expressed as a rotation in radians of the standard
%    oriented frame (see below). Positive rotations appear clockwise
%    since the image coordiante system is left-handed.
%
%  Ellipse::
%    FRAME has 5 components. FRAME(1:2) are the x,y coordiantes of the
%    center and FRAME(3:5) are the elements S11, S12, S22 of a 2x2
%    covariance matrix S (a positive semidefinite matrix) defining the
%    ellipse shape. The ellipse is the set of points {x + T: x' inv(S)
%    x = 1}, where T is the ellipse center.
%
%  Oriented ellipse::
%    FAME has 6 components. FRAME(1:2) are the coordiantes T=[x;y] of
%    the center. FRAME(3:6) is the column-wise stacking of a 2x2
%    matrix A. The oriented ellipse is obtained by applying the affine
%    transformation (A,T) to the standard oriented frame (see below).
%
%  A standard unoriented frame is a circle of unit radius centered at
%  the origin; a standard oriented frame is the same, but marked with
%  a radius pointing towards the positive Y axis (downwards) to
%  represent the frame orientation. All other frames can be obtained
%  as affine transformations of these two. In the case of unoriented
%  frames, this transformation is ambiguous up to a rotation.
%
%  VL_PLOTFRAME(FRAMES), where FRAMES is a D x N matrix, plots N
%  frames, one per column. This is significantly more efficient than
%  looping over frames explicitly.
%
%  H = VL_PLOTFRAME(...) returns the handle H of the graphical object
%  representing the frames.
%
%  VL_PLOTFRAME(FRAMES,...) passes any extra argument to the
%  underlying plotting function. The first optional argument, in
%  particular, can be a line specification string such as the one used
%  by PLOT().
%
%  See also: <a href="matlab:vl_help('sift')">SIFT</a>,
%  <a href="matlab:vl_help('covdet')">covariant detectors</a>,
%  VL_FRAME2OELL(), VL_HELP().

% Copyright (C) 2007-12 Andrea Vedaldi and Brian Fulkerson.
% Copyright (C) 2013 Andrea Vedaldi.
% All rights reserved.
%
% This file is part of the VLFeat library and is made available under
% the terms of the BSD license (see the COPYING file).

% number of vertices drawn for each frame
np = 40 ;

lineprop = {} ;
if length(varargin) > 0
  lineprop = vl_linespec2prop(varargin{1}) ;
  lineprop = {lineprop{:}, varargin{2:end