Matlab - Popupmenu conectado a excel

function volcanes

clc

gui_Singleton = 1;

gui_State = struct('gui_Name',       mfilename, ...

    'gui_Singleton',  gui_Singleton, ...

    'gui_OpeningFcn', @volcanes_OpeningFcn, ...

    'gui_OutputFcn',  @volcanes_OutputFcn, ...

    'gui_LayoutFcn',  [] , ...

    'gui_Callback',   []);

h1=uicontrol('style','pushbutton','string','Actualizar','position', [50 380 100 25],'callback',@h1_callback);

h2=uicontrol('style','popup','string','Volcanes','position', [50 320 100 50],'callback',@h2_callback);

h3=uicontrol('style','popup','string','Opciones','position', [50 270 100 50],'callback',@h3_callback);

h4=uicontrol('style','text','string',' ','position', [50 80 90 150]);

    function h1_callback(~,~,~)

        filename = 'volcanes1.xlsx';

        xlRange = 'B2:B51';

        [~, ~, vol1] = xlsread(filename, xlRange);

        j=1;

        while isnan(vol1{j})==0

            vol2{j}=vol1{j};

            j=j+1;

        end

        set(h2,'string',vol2)

    end

    function h2_callback(~,~,~)

        filename = 'volcanes1.xlsx';

        s=get(h2,'value')+1;

        xlRange = ['C' num2str(s) ':Z' num2str(s)];

        [~, ~, opc1] = xlsread(filename, xlRange);

        j=1;

        while isnan(opc1{j})==0

            opc2{j}=opc1{j};

            j=j+1;

        end

        set(h3,'string',opc2)

    end

function h3_callback(~,~,~)

        filename = 'volcanes1.xlsx';

        p=get(h3,'string');

        p0=get(h3,'value');

        s=get(h2,'string');

        s0=get(h2,'value');

        xlRange = ['A' num2str(s0+1) ':A' num2str(s0+1)];

        [~, ~, cam1] = xlsread(filename, xlRange);

        j=1;

        disp(s(s0))

        set(h4,'string',['Cámara : ' cam1 ' Volcán : ' char(s{s0}) 'Locación : ' char(p{p0})])

    end

end