www.gusucode.com > 基于GUI界面的比例导引弹道仿真matlab源码程序 > 基于GUI界面的比例导引弹道仿真matlab源码程序/qzy33.m

    function varargout = qzy33(varargin)
% QZY33 M-file for qzy33.fig
%      QZY33, by itself, creates a new QZY33 or raises the existing
%      singleton*.
%
%      H = QZY33 returns the handle to a new QZY33 or the handle to
%      the existing singleton*.
%
%      QZY33('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in QZY33.M with the given input arguments.
%
%      QZY33('Property','Value',...) creates a new QZY33 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before qzy33_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to qzy33_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 qzy33

% Last Modified by GUIDE v2.5 15-Dec-2007 16:55:10

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @qzy33_OpeningFcn, ...
                   'gui_OutputFcn',  @qzy33_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin & isstr(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 qzy33 is made visible.
function qzy33_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 qzy33 (see VARARGIN)
%uicontrol(gcf,'Style','Frame',...
 %  'Units','normalized',...
 %  'Position',[.84,.018,.002,.923],...
 %  'Back',[.5 .5 .5]);
%set(gcf,'NumberTitle',''); 
%set(gcf,'menubar','none');
set(handles.K,'visible','off');
set(handles.K1,'visible','off');

% Choose default command line output for qzy33
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes qzy33 wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = qzy33_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;


% --- Executes on button press in push_start.
function push_start_Callback(hObject, eventdata, handles)
% hObject    handle to push_start (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%最优制导率仿真,初始化参数

global signvc;
g=9.81;
pi=3.14159265;
tgst=get(handles.pop_t,'value');
k=str2num(get(handles.K,'string'));
vm=str2num(get(handles.vm,'string'));
vt=str2num(get(handles.vt,'string'));%导弹和目标的速度
mtc=vm/vt;
headerror=str2num(get(handles.headerror,'string'))*pi/180; %指向角误差
thetat=str2num(get(handles.thetat,'string'))*pi/180;    %目标的速度方向
rmx=0;rmy=0;
rtx=str2num(get(handles.tx,'string'));       %初始目标坐标X
rty=str2num(get(handles.ty,'string'));      %初始目标坐标Y
at=str2num(get(handles.at,'string'))*g;%目标法向加速度
vtx=vt*sin(thetat);%目标的速度分量
vty=vt*cos(thetat);
rtmx=rtx-rmx;%弹目相对距离
rtmy=rty-rmy;
ammax=str2num(get(handles.ammax,'string'))*g;%导弹的最大机动能力为15g
rtm=sqrt(rtmx^2+rtmy^2);
sightangle=atan(rtmx/rtmy);%视线角
leadangle=asin(vt*sin(sightangle-thetat)/vm);%指向角
vmx=vm*sin(sightangle-leadangle+headerror);%导弹的速度分量
vmy=vm*cos(sightangle-leadangle+headerror);
vtmx=vtx-vmx;
vtmy=vty-vmy;
%弹目的相对运动速度
vc=-(rtmx*vtmx+rtmy*vtmy)/rtm;
signvc=sign(vc); %vc的符号
time=0;timestep=str2num(get(handles.dt,'string'));%时间和时间步长
%file=fopen('output.dat','wt');%将数据写入文件
%循环
while(1)
    %vc改变符号仿真结束
   if(sign(vc)~=signvc)
  break;
else if(rtm<100)%弹目距离小于100，步长变为0.005
        timestep=0.005;
    end
signvc=sign(vc);
%视线角速率
dsightangle=(rtmy*vtmx-rtmx*vtmy)/(rtm^2);
if (tgst==1)
dtheta=3*vc*dsightangle/vm;%最优导引律
end

if (tgst==2)
dtheta=k*vc*dsightangle/vm;%比例导引
end

if (tgst==3)
dtheta=3*(vc*dsightangle+0.5*at)/vm;         %加速度修正项
%dtheta=(vc*rtm^3/(vc^3+3*rtm^3))*dsightangle;
end

theta=atan(vmx/vmy);
%导弹加速度
am=vm*dtheta;
%限制机动能力
if(abs(am)>ammax)
    am=sign(am)*ammax;
end
%加速度分量
amx=am*cos(sightangle);
amy=-am*sin(sightangle);
amfa=am*cos(sightangle-theta);
time=time+timestep;


%if(time>=5)
    %at=-1*g*sign(sin(pi*(time-5)/10));      %目标作开关机动每10秒一次
    %end
   
%目标位置
rtx=rtx+timestep*vtx;
rty=rty+timestep*vty;
dthetat=at/vt;
thetat=thetat+timestep*dthetat;
vtx=vt*sin(thetat);%目标的速度分量
vty=vt*cos(thetat);
%导弹位置
rmx=rmx+timestep*vmx;
rmy=rmy+timestep*vmy;
rm=sqrt(rmx^2+rmy^2);
%导弹速度
vmx=vmx+timestep*amx;
vmy=vmy+timestep*amy;
vm=sqrt(vmx^2+vmy^2);
%弹目相对位移
rtmx=rtx-rmx;
rtmy=rty-rmy;
%上一步的脱靶量
rtm0=rtm;
rtm=sqrt(rtmx^2+rtmy^2);

sightangle=atan(rtmx/rtmy);%视线角
%弹目相对速度
vtmx=vtx-vmx;
vtmy=vty-vmy;
vc=-(rtmx*vtmx+rtmy*vtmy)/rtm;

 if(abs(rtm)<2)
     break;
 end
    
%数据写入文件
%fprintf(file,'%f %f %f %f %f %f %f %f \n',time,rmx,rmy,rtx,rty,sqrt(amx^2+amy^2),rtm,am);
h1=subplot(handles.h1);plot(rmy,rmx,'b',rty,rtx,'r'),hold on,
h2=subplot(handles.h2);plot(time,amfa/9.81),hold on,%画出法向过载随时间的变化
%h3=subplot(handles.h3);plot(time,vm),hold on,
h3=subplot(handles.h3);plot(time,sightangle*57.3),hold on,

h4=subplot(handles.h4);plot(time,dsightangle*57.3),hold on,
end
end
tbl=rtm;
zysj=time;
fxgz=amfa/9.81;
reset(h1);
reset(h2);
reset(h3);
reset(h4);

set(handles.zysj,'string',zysj);
set(handles.tbl,'string',tbl);
set(handles.mtc,'string',mtc);

set(get(h1,'xlabel'),'string','x (m)');
set(get(h1,'ylabel'),'string','y (m)');
legend(h1,'导弹','目标',0);
set(get(h1,'title'),'string','弹道曲线');

set(get(h2,'xlabel'),'string','时间t (s)');
set(get(h2,'ylabel'),'string','法向过载am (g)');
set(get(h2,'title'),'string','法向过载随时间的变化');

set(get(h3,'xlabel'),'string','时间t (s)');
%set(get(h3,'ylabel'),'string','导弹速度vm (m/s)');
%set(get(h3,'title'),'string','导弹速度随时间的变化');
set(get(h3,'ylabel'),'string','视线角q (\circ)');
set(get(h3,'title'),'string','视线角随时间的变化');

set(get(h4,'xlabel'),'string','时间t (s)');
set(get(h4,'ylabel'),'string','视线转率\theta (\circ)');
set(get(h4,'title'),'string','视线转率随时间的变化');
grid(h1);
grid(h2);
grid(h3);
grid(h4);



%status=fclose(file);

% --- Executes on button press in push_return.
function push_return_Callback(hObject, eventdata, handles)
% hObject    handle to push_return (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close(gcf);mb;clear;

% --- Executes during object creation, after setting all properties.
function vm_CreateFcn(hObject, eventdata, handles)
% hObject    handle to vm (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function vm_Callback(hObject, eventdata, handles)
% hObject    handle to vm (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 vm as text
%        str2double(get(hObject,'String')) returns contents of vm as a double


% --- Executes during object creation, after setting all properties.
function vt_CreateFcn(hObject, eventdata, handles)
% hObject    handle to vt (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function vt_Callback(hObject, eventdata, handles)
% hObject    handle to vt (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 vt as text
%        str2double(get(hObject,'String')) returns contents of vt as a double


% --- Executes during object creation, after setting all properties.
function dt_CreateFcn(hObject, eventdata, handles)
% hObject    handle to dt (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function dt_Callback(hObject, eventdata, handles)
% hObject    handle to dt (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 dt as text
%        str2double(get(hObject,'String')) returns contents of dt as a double


% --- Executes during object creation, after setting all properties.
function headerror_CreateFcn(hObject, eventdata, handles)
% hObject    handle to headerror (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function headerror_Callback(hObject, eventdata, handles)
% hObject    handle to headerror (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 headerror as text
%        str2double(get(hObject,'String')) returns contents of headerror as a double


% --- Executes during object creation, after setting all properties.
function thetat_CreateFcn(hObject, eventdata, handles)
% hObject    handle to thetat (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function thetat_Callback(hObject, eventdata, handles)
% hObject    handle to thetat (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 thetat as text
%        str2double(get(hObject,'String')) returns contents of thetat as a double


% --- Executes during object creation, after setting all properties.
function at_CreateFcn(hObject, eventdata, handles)
% hObject    handle to at (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function at_Callback(hObject, eventdata, handles)
% hObject    handle to at (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 at as text
%        str2double(get(hObject,'String')) returns contents of at as a double


% --- Executes during object creation, after setting all properties.
function ammax_CreateFcn(hObject, eventdata, handles)
% hObject    handle to ammax (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function ammax_Callback(hObject, eventdata, handles)
% hObject    handle to ammax (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 ammax as text
%        str2double(get(hObject,'String')) returns contents of ammax as a double


% --- Executes during object creation, after setting all properties.
function h2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to h2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: place code in OpeningFcn to populate h2


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

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


% --- Executes on selection change in pop_t.
function pop_t_Callback(hObject, eventdata, handles)
% hObject    handle to pop_t (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: contents = get(hObject,'String') returns pop_t contents as cell array
%        contents{get(hObject,'Value')} returns selected item from pop_t
tgst1=get(handles.pop_t,'value');
if (tgst1==1||tgst1==3)
set(handles.K,'visible','off');
set(handles.K1,'visible','off');
end
if (tgst1==2)
set(handles.K,'visible','on');
set(handles.K1,'visible','on');
end

% --- Executes during object creation, after setting all properties.
function K_CreateFcn(hObject, eventdata, handles)
% hObject    handle to K (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function K_Callback(hObject, eventdata, handles)
% hObject    handle to K (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 K as text
%        str2double(get(hObject,'String')) returns contents of K as a double


% --------------------------------------------------------------------
function Untitled_1_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


% --------------------------------------------------------------------
function Exit_Callback(hObject, eventdata, handles)
% hObject    handle to Exit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
close(qzy33);

% --------------------------------------------------------------------
function Untitled_4_Callback(hObject, eventdata, handles)
% hObject    handle to Untitled_4 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)


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

% --------------------------------------------------------------------
function Rotate3d_Callback(hObject, eventdata, handles)
% hObject    handle to Rotate3d (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
rotate3d;


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

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


% --- Executes during object creation, after setting all properties.
function tx_CreateFcn(hObject, eventdata, handles)
% hObject    handle to tx (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function tx_Callback(hObject, eventdata, handles)
% hObject    handle to tx (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 tx as text
%        str2double(get(hObject,'String')) returns contents of tx as a double


% --- Executes during object creation, after setting all properties.
function edit11_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit11 (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function edit11_Callback(hObject, eventdata, handles)
% hObject    handle to edit11 (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 edit11 as text
%        str2double(get(hObject,'String')) returns contents of edit11 as a double


% --- Executes during object creation, after setting all properties.
function ty_CreateFcn(hObject, eventdata, handles)
% hObject    handle to ty (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function ty_Callback(hObject, eventdata, handles)
% hObject    handle to ty (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 ty as text
%        str2double(get(hObject,'String')) returns contents of ty as a double


% --- Executes during object creation, after setting all properties.
function mtc_CreateFcn(hObject, eventdata, handles)
% hObject    handle to mtc (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function mtc_Callback(hObject, eventdata, handles)
% hObject    handle to mtc (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 mtc as text
%        str2double(get(hObject,'String')) returns contents of mtc as a double


% --- Executes during object creation, after setting all properties.
function zysj_CreateFcn(hObject, eventdata, handles)
% hObject    handle to zysj (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function zysj_Callback(hObject, eventdata, handles)
% hObject    handle to zysj (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 zysj as text
%        str2double(get(hObject,'String')) returns contents of zysj as a double


% --- Executes during object creation, after setting all properties.
function tbl_CreateFcn(hObject, eventdata, handles)
% hObject    handle to tbl (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
    set(hObject,'BackgroundColor','white');
else
    set(hObject,'BackgroundColor',get(0,'defaultUicontrolBackgroundColor'));
end



function tbl_Callback(hObject, eventdata, handles)
% hObject    handle to tbl (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 tbl as text
%        str2double(get(hObject,'String')) returns contents of tbl as a double