Unrecognized function or variable in APP DESIGNER

Hi,

when I push Vypocet_Button i my app, it calculates points of great circle on sphere. And I need to use these results, when I push another ProtokolButton (it should generate .txt with results). The problem is that, the app does not have in memory values calculated after pushing first button (Unrecognized function or variable). I tried to use Properties, but with no result...

% Button pushed function: Vypocet_Button
        function Vypocet_ButtonPushed(app, event)
            Ua_D = app.VychBod_U_stupen.Value;
            Ua_M = app.VychBod_U_minuta.Value;
            Ua_S = app.VychBod_U_vterina.Value;
            Va_D = app.VychBod_V_stupen.Value;
            Va_M = app.VychBod_V_minuta.Value;
            Va_S = app.VychBod_V_vterina.Value;
            
            Ub_D = app.KoncBod_U_stupen.Value;
            Ub_M = app.KoncBod_U_minuta.Value;
            Ub_S = app.KoncBod_U_vterina.Value;
            Vb_D = app.KoncBod_V_stupen.Value;
            Vb_M = app.KoncBod_V_minuta.Value;
            Vb_S = app.KoncBod_V_vterina.Value;
            
            R = app.PolomrkoulemEditField.Value;
            poc = app.PoetmezilehlchbodEditField.Value;
            
            Ua = deg2rad(Ua_D + Ua_M/60 + Ua_S/3600);
            Va = deg2rad(Va_D + Va_M/60 + Va_S/3600);
            Ub = deg2rad(Ub_D + Ub_M/60 + Ub_S/3600);
            Vb = deg2rad(Vb_D + Vb_M/60 + Vb_S/3600);
            
            % ortodroma
            V_orto_int = (Vb-Va)/poc; % pravidelne deleni intevalu vymezeneho zemepisnymi delkami bodu A a B
            V_orto = Va:V_orto_int:Vb; % vektor zem.delek boduu ortodromy
            l_orto = acos(cos(pi/2-Ua)*cos(pi/2-Ub) + sin(pi/2-Ua)*sin(pi/2-Ub)*cos(Vb-Va)); % delka orodromy
            azi_orto = asin((cos(Ub)*sin(Vb-Va)) / (sin(l_orto))); % azimut na prvnim bode
            
            U_orto = Ua;
            for i = 1:length(V_orto)-1  %vypocet zem. sirek jednotlivych bodu
                  alfa(i) = acos(-cos(azi_orto(i))*cos(V_orto_int) + sin(azi_orto(i))*sin(V_orto_int)*cos(pi/2 - U_orto(i)));
                  azi_orto(i+1) = pi - alfa(i);
                  U_orto(i+1) = pi/2 - asin((sin(pi/2 - U_orto(i))*sin(azi_orto(i))) / (sin(alfa(i))));
            end
            
            U_orto = degrees2dms(rad2deg(U_orto)); % prevod na stupne
            V_orto = degrees2dms(rad2deg(V_orto));
        end

        % Button pushed function: ProtokolButton
        function ProtokolButtonPushed(app, event)
            hlavicka1 = '---------SOURADNICE BODU ORTODROMY---------';
            hlavicka2 = 'c.b.        U[D M S]              V[D M S]';
            cb = 1:poc+1 ;
            fileID = fopen('vysledky.txt','w');
            
            fprintf(fileID,'%s\n',hlavicka1);
            fprintf(fileID,'%s\n',hlavicka2);
            
            fprintf(fileID,'%2d %8d %4d %7.3f %8d %4d %7.3f\n',[cb; U_orto(:,1)'; U_orto(:,2)'; U_orto(:,3)';V_orto(:,1)'; V_orto(:,2)'; V_orto(:,3)']);
            fprintf(fileID,'delka ortodromy = %.3f m\n',l_orto)
            fprintf(fileID,'%s\n','  ')
        end
    end

[Cris LaPierre]

What variable can't it find? Please share the complete error message (all the red text)

[Jakub Snopl]

Unrecognized function or variable 'poc'.

Error in App_KartoZobraz_update_031121/ProtokolButtonPushed (line 225)

cb = 1:poc+1 ;

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 410)

Error while evaluating Button PrivateButtonPushedFcn.

Answer 1

[Cris LaPierre]

Keep in mind variable scope. Variables created inside a function are destroyed as soon as the function ends. You need to add those variables you want to access in another callback to the apps structure. You do this my listing them as app properties, and then assigning to and accessing them by prepending them with 'app.'. See the 'Share Data Within App Designer Apps' page.

For example

app.l_orto = acos(cos(pi/2-Ua)*cos(pi/2-Ub) + sin(pi/2-Ua)*sin(pi/2-Ub)*cos(Vb-Va)); % delka orodromy

...

fprintf(fileID,'delka ortodromy = %.3f m\n',app.l_orto)

[Jakub Snopl]

thank you, it helped