how to read numeric data in text file and plot a graph in GUI ?

Dear user i have a matlab code and text file for the above question but it shows some error ,please help me.

 matlab code is ....
 function varargout = pt(varargin)
 % PT MATLAB code for pt.fig
%      PT, by itself, creates a new PT or raises the existing
%      singleton*.
%
%      H = PT returns the handle to a new PT or the handle to
%      the existing singleton*.
%
%      PT('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in PT.M with the given input arguments.
%
%      PT('Property','Value',...) creates a new PT or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before pt_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to pt_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

 % Edit the above text to modify the response to help pt

 % Last Modified by GUIDE v2.5 15-Apr-2014 10:50:37

 % Begin initialization code - DO NOT EDIT
 gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @pt_OpeningFcn, ...
                   'gui_OutputFcn',  @pt_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
 if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
 end

 if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
 else
    gui_mainfcn(gui_State, varargin{:});
 end
 % End initialization code - DO NOT EDIT

 % --- Executes just before pt is made visible.
 function pt_OpeningFcn(hObject, eventdata, handles, varargin)
 % This function has no output args, see OutputFcn.
 % hObject    handle to figure
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)
 % varargin   command line arguments to pt (see VARARGIN)

 % Choose default command line output for pt
 handles.output = hObject;

 % Update handles structure
 guidata(hObject, handles);

 % UIWAIT makes pt wait for user response (see UIRESUME)
 % uiwait(handles.figure1);

 % --- Outputs from this function are returned to the command line.
 function varargout = pt_OutputFcn(hObject, eventdata, handles) 
 % varargout  cell array for returning output args (see VARARGOUT);
 % hObject    handle to figure
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)

 % Get default command line output from handles structure
 varargout{1} = handles.output;

 function class_Callback(hObject, eventdata, handles)
 % hObject    handle to class (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)

 % Hints: get(hObject,'String') returns contents of class as text
 %        str2double(get(hObject,'String')) returns contents of class as a          double

 class=get(hObject,'string')
 % --- Executes during object creation, after setting all properties.
 function class_CreateFcn(hObject, eventdata, handles)
 % hObject    handle to class (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    empty - handles not created until after all CreateFcns called

 % Hint: edit controls usually have a white background on Windows.
 %        See ISPC and COMPUTER.
 if ispc && isequal(get(hObject,'BackgroundColor'),            

 get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');0
 end

 function trial_Callback(hObject, eventdata, handles)
 % hObject    handle to trial (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)

 % Hints: get(hObject,'String') returns contents of trial as text
 %        str2double(get(hObject,'String')) returns contents of trial as a   double
 trial=get(hObject,'string')

 % --- Executes during object creation, after setting all properties.
 function trial_CreateFcn(hObject, eventdata, handles)
 % hObject    handle to trial (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    empty - handles not created until after all CreateFcns called

 % Hint: edit controls usually have a white background on Windows.
 %       See ISPC and COMPUTER.
 if ispc && isequal(get(hObject,'BackgroundColor'),    
 get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
 end

 % --- Executes on button press in pushbutton1.
 function pushbutton1_Callback(hObject, eventdata, handles)
 % hObject    handle to pushbutton1 (see GCBO)
 % eventdata  reserved - to be defined in a future version of MATLAB
 % handles    structure with handles and user data (see GUIDATA)
 axes(handles.axes1);
 cla;
 class= get(handles.class,'String')
 trial= get(handles.trial,'String')
 % class='001'
 % trial='01'
 filname=sprintf('%st%s.txt',class ,trial);
 fid=fopen(filname)
 s=textscan(fid,'%d %d %d','headerlines',25)
 fclose(fid)
 X=s{1}
 Y=s{2}
 z=s{3}

 h=plot(X,-Y,'or','LineWidth',1);

%--------------------------------------------End-------------------------------------------------

Text file name= 005t01.txt. This file in gui class is 005 and trial is 01, It contains below contents.

 .VERSION 1.0 1
.HIERARCHY CHARACTER
.COORD X Y T
.SEGMENT CHARACTER
.X_POINTS_PER_INCH 2500
.Y_POINTS_PER_INCH 2500
.POINTS_PER_SECOND 120
.WRITER_ID 1
.AGE 40
.SEX MALE
.HAND R
.SKILL Proficient
.STYLE NORMAL
.COUNTRY IN
.WRITER_INFO
 WriterName:SHARANAPPA
 WriterTrialNo:1
 WriterProfession:FACCULTY
 WritingSetup:X
 WritingFrequency:Everyday
 WritingInProfession:No
 WritingFile:dcpath
 .PEN_DOWN
3266 752 10266
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4423 513 0
4426 524 16844
.PEN_UP
%---------------------------------end------------------------
 when execute above code shows Error like this
>> pt

class =

005

trial =

    '01'

class =

005

trial =

    '01'

Error using sprintf Function is not defined for 'cell' inputs.

Error in pt>pushbutton1_Callback (line 133) filname=sprintf('%st%s.txt',class ,trial);

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in pt (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)pt('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback