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: read_ply.m
    path of file: ./repos/GMM-FEM/IO
    
    the code of the file until where you have to start completion: function [vertex,face] = read_ply(filename)

% read_ply - read data from PLY file.
%
%   [vertex,face] = read_ply(filename);
%
%   'vertex' is a 'nb.vert x 3' array specifying the position of the vertices.
%   'face' is a 'nb.face x 3' array specifying the connectivity of the mesh.
%
%   IMPORTANT: works only for triangular meshes.
%
%   Copyright (c) 2003 Gabriel Peyrï¿½

[d,c] = plyread(filename);

vi = d.face.vertex_indices;
nf = length(vi);
face = zeros(nf,3);
for i=1:nf
    face(i,:) = vi{i}+1;
end

vertex = [d.vertex.x, d.vertex.y, d.vertex.z];





%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [Elements,varargout] = plyread(Path
    
function [Elements,varargout] = plyread(Path,Str)
%PLYREAD   Read a PLY 3D data file.
%   [DATA,COMMENTS] = PLYREAD(FILENAME) reads a version 1.0 PLY file
%   FILENAME and returns a structure DATA.  The fields in this structure
%   are defined by the PLY header; each element type is a field and each
%   element property is a subfield.  If the file contains any comments,
%   they are returned in a cell string array COMMENTS.
%
%   [TRI,PTS] = PLYREAD(FILENAME,'tri') or
%   [TRI,PTS,DATA,COMMENTS] = PLYREAD(FILENAME,'tri') converts vertex
%   and face data into triangular connectivity and vertex arrays.  The
%   mesh can then be displayed using the TRISURF command.
%
%   Note: This function is slow for large mesh files (+50K faces),
%   especially when reading data with list type properties.
%
%   Example:
%   [Tri,Pts] = PLYREAD('cow.ply','tri');
%   trisurf(Tri,Pts(:,1),Pts(:,2),Pts(:,3)); 
%   colormap(gray); axis equal;
%
%   See also: PLYWRITE

% Pascal Getreuer 2004

[fid,Msg] = fopen(Path,'rt');	% open file in read text mode

if fid == -1, error(Msg); end