Syms in a GUI

Hi,

A simple question. I have an equation that need input parameter. I want this parameter can be choose in a gui befor solving.

But I have some problem when i creat my variable : lamb

Error using assignin
Attempt to add "lamb" to a
static workspace.
 See MATLAB Programming,
 Restrictions on Assigning to
 Variables for details.

Error in syms (line 66)
        assignin('caller',x,sym(x));
        
Error in CodeexeBETA/PushB
(line 130)
        syms  str2sym(lamb)
 
Error while evaluating uicontrol Callback

function Simu

close all
f=figure('units','normalized','outerposition',[0 0 1 1]);

%%%%%%%%%%%%%%%%%%%Laser param
dim = [.2 .5 .3 .3];
str = 'Thickness [nm]';
annotation('textbox',dim,'String',str,'FitBoxToText','on','Position',[0.0 0.95 0.075 0.05]);
edit1= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.0 0.95 0.075 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','680');


str2 = 'Radius [µm]';
annotation('textbox',dim,'String',str2,'FitBoxToText','on','Position',[0.075 0.95 0.06 0.05]);
edit2= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.075 0.95 0.06 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','28');


str3 = 'Lambda_{ini} [nm]';
annotation('textbox',dim,'String',str3,'FitBoxToText','on','Position',[0.135 0.95 0.07 0.05]);
edit3= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.135 0.95 0.07 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','800');



str4 = 'Lambda_{end} [nm]';
annotation('textbox',dim,'String',str4,'FitBoxToText','on','Position',[0.205 0.95 0.07 0.05]);
edit4= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.205 0.95 0.07 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','1200');



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


str9 = 'Gas';
annotation('textbox',dim,'String',str9,'FitBoxToText','on','Position',[0.545 0.95 0.04 0.05]);
edit9= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.545 0.95 0.04 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','0');
listbox1 = uicontrol('Style','listbox','Units', 'normal','Position',[0.545 0.95 0.04 0.02],'Max',6,'String',{'Air';'Argon';'Xenon'})  ;


str10 = 'P (bar)';
annotation('textbox',dim,'String',str10,'FitBoxToText','on','Position',[0.585 0.95 0.04 0.05]);
edit10= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.585 0.95 0.04 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','1');


str11 = 'Number of point ';
annotation('textbox',dim,'String',str11,'FitBoxToText','on','Position',[0.71 0.95 0.1 0.05]);
edit11= uicontrol( 'Style', 'edit','Units', 'normal','Position',[0.71 0.95 0.1 0.02],'FontSize', 15,'BackgroundColor', 'white',...
    'String','200');



PushButton = uicontrol(gcf,'Style', 'push', 'String', 'Run','Units', 'normal','Position',[0.9 0.95 0.05 0.02],'CallBack', @PushB);
PushButton2 = uicontrol(gcf,'Style', 'push', 'String', 'Stop','Units', 'normal','Position',[0.9 0.9 0.05 0.02],'CallBack', @endLoop);

    function endLoop(hObject,eventdata,handles)
        handles.endLoop=true;
        guidata(hObject, handles);
    end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    function [] = PushB(hObject,eventdata,handles)
        
        % val = str2num(char(get(edit11,'String')));
        edi1 = str2num(char(get(edit1,'String')));
        edi2 = str2num(char(get(edit2,'string')));
        edi3= str2num(char(get(edit3,'string')));
        edi4 =str2num(char(get(edit4,'string')));
       
        edi9 =str2num(char(get(edit9,'string')));
        edi10 = str2num(char(get(edit10,'string')));
        edi11 = str2num(char(get(edit11,'string')));
       
        
        % gas= (char(get(listbox1,'String')));
        
        
        index_selected = get(listbox1,'Value');
        list = get(listbox1,'String');
        gas = list{index_selected}; % Convert from cell array
        % to string
    
     
        
        gas;
        
   


a=2.405*2.405;
c=3e8;

rc=edi2.*1e-6; %en m
t=edi1.*1e-9;% en m
n_g=1.45;

Pression_bar=edi10;
Pression_Pa=Pression_bar*1e5;           %%%%%  (Pa)  %%%%%%%
Pression_atm=101325; 
pgas=Pression_bar *1e5;



nbr=edi11;

L_start=edi3  ;
L_stop= edi4 ;

%%%%%%%FOR solving the equation
A1=0.05792105;
    A2=238.0185;
    B1=0.00167917;
    B2=57.362;
    C1=0;
    C2=0;
syms lamb 
ngas= 1 + pgas/101325.* (   (A1 ./ (A2-(lamb.*1e6).^-2) ) + (B1 ./ (B2-(lamb.*1e6).^-2) ) + (C1 ./ (C2-(lamb.*1e6).^-2)  )); %ARGON

epsi= n_g.^2 ./ ngas.^2;

k_0= 2*pi./(lamb);
phi = k_0*t* sqrt(n_g.^2-ngas.^2) ;
A=a./( 2.*ngas .*(k_0.*rc).^2);
B=a./ ( ngas.^2 .*(k_0.*rc).^3  );
C = epsi;
D = 0.5 .* (C+1) ./ sqrt(C-1);

nef= ngas - A - B.*D.*cot(phi);


dn = diff(nef,lamb);

dn2 = diff(dn,lamb);
dn3 = diff(dn2,lamb);


beta2=lamb.^3.*dn2./(2*pi*c.^2);

beta3=-lamb.^4./(2*pi*c).^2 .*(3.*dn2./c + lamb.*dn3./c);

% lamb=linspace(800,1200,nbr).*1e-9;

GVD=double(subs(beta2));
TOD=double(subs(beta3));
NEFF=double(subs(neff));

% plot(lamb,GVD)
% figure, plot(lamb,TOD)


    end


end

is There an other way than syms?

Regards

Martin

Answer 1

[Walter Roberson]

lamb = sym('lamb') ;

Your use of handles suggests that you are using guide. guide cannot manage functions that have matching "end" statements, including not being able to handle nested functions or shared variables.

[MartinM]

Perfect.