MATLAB: What happened to the folowing code

Question

• Code: *function pb1_Callback(hObject, eventdata, handles)% hObject handle to pb1 (see GCBO)% eventdata reserved – to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)

alpha= str2num(get(handles.edit1,'String'));

 pics=alpha;  %no of pictures to be processed given by user
titl=0;  %%helping to show title once
subplt=1;  %%showing no of figures

imgs = cell(1, pics); %% array for pics

imgs{1} = imread('C:\Users\Romesha\Desktop\eye2.jpg'); %% reading images from GUI imgs{2} = imread('C:\Users\Romesha\Desktop\001_1_2.bmp'); %%—————%% imgs{3} = imread('gray.jpg'); %%————–%%

for i1=1:pics

im = imgs{i1};

subplot(pics,4,subplt); %% subplot(no_of_columns %%,no_of_row,numbering_0f_pic_in_column) imshow(im);

if titl==0 title('real Image'); end

subplt=subplt+1;

[r c wid] = size(im);

if wid==1 k(:,:,1)=im; k(:,:,2)=im; k(:,:,3)=im; else k=im; end

pt = ginput(2);

x1 = pt(1,1); y1 = pt(1,2); x2 = pt(2,1); y2 = pt(2,2); x = [x1 x2]; y = [y1 y2];

r = sqrt((x2-x1)^2 + (y2-y1)^2);

for i=1:size(k,1) for j=1:size(k,2) x2 = j; y2 = i; val = floor(sqrt((x2-x1)^2 + (y2-y1)^2)); if(val == floor(r)) nim(i,j,1) = 255; nim(i,j,2) = 0; nim(i,j,3) = 0; BW(i,j) = 1;

        else
            nim(i,j,1) = k(i,j,1);
            nim(i,j,2) = k(i,j,2);
            nim(i,j,3) = k(i,j,3);
            BW(i,j) = 0;
        end
    end
end

SE = strel('disk',1); BW3 = imdilate(BW,SE);

I2 = imfill(BW3,'holes');

for i=1:size(k,1) for j=1:size(k,2) if(I2(i,j)==1) ni(i,j,1) = k(i,j,1); ni(i,j,2) = k(i,j,2); ni(i,j,3) = k(i,j,3); else ni(i,j,1) = 0; ni(i,j,2) = 0; ni(i,j,3) = 0; end end end

ni = uint8(ni);

X1 = x1-r; X2 = x1+r;

Y1 = y1-r; Y2 = y1+r;

ROI = imcrop(ni,[X1,Y1,abs(X2-X1),abs(Y2-Y1)]); if wid==1 ROI = ROI(:,:,1); end

subplot(pics,4,subplt); imshow(ROI);

if titl==0 title('Croped pic'); end subplt=subplt+1;

%% histogram Equalization

% J = histeq(ROI); % % subplot(pics,4,subplt); % imshow(J); % if titl==0 % title('histogram equalization'); % end % subplt=subplt+1;

%% thresholding level = graythresh(ROI); e= im2bw(ROI,0.5);

% level = graythresh(J); % e= im2bw(level,0.5); % subplot(pics,4,subplt); imshow(e);

if titl==0 title('threshold'); end subplt=subplt+1; %% invertinng image (taking complement of image) IM2 = imcomplement(e);

subplot(pics,4,subplt); imshow(IM2);

if titl==0 title('inverted image'); end subplt=subplt+1; %% locating Circle Using Hough Transfrom Rmin = 30; Rmax = 200;

[centersBright, radiiBright] = imfindcircles(IM2,[Rmin Rmax],'Sensitivity',0.9);

[centersDark, radiiDark] = imfindcircles(IM2,[Rmin Rmax],'ObjectPolarity','dark');

t=viscircles(centersBright, radiiBright,'EdgeColor','b') C2=viscircles(centersDark, radiiDark,'LineStyle','–') %% Normalization % % c=ezpolar('1+cos(t)'); % imshow(c);

titl=titl+1; end

Error

Error using str2num (line 33) Requires string or character array input.

Error in gui3>pb1_Callback (line 82) alpha= str2num(get(handles.edit1,'String'));

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

Error in gui3 (line 42) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)gui3('pb1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

Answer 1

That means that handles.edit1 is not defined!!