Why my code keep running non stop?

Hi. I wanna know why my code keep running non stop? There's no error displayed.

image1= getimage(handles.axes1)
 
bw1=imresize(image1,[128 128])
bw1=rgb2gray(bw1)
%binarization 
bw1=im2double(bw1);
bw1 = im2bw(bw1,0.90);


%thinning
BW3=bwmorph(~bw1,'thin',0.9)


%Extracting black pixel
k=1
for i=1:128
    for j=1:128
        if(BW3(i,j)==0)
            u(k)=i
            v(k)=j
            k=k+1
            BW3(i,j)=1
        end
    end
end
C=[u;v] %the curve of signature
N=k-1 %no of pixel in signature
oub=sum(C(1,:))/N %x coordinate cnter of mass
ovb=sum(C(2,:))/N %y coordinate cnter of mass

%rotate
for i=1:N
      u(i)=u(i)-oub+1
      v(i)=v(i)-ovb+1
end
%the new curve of signature
C=[u;v]
ub=sum(C(1,:))/N
vb=sum(C(2,:))/N
ubSq=sum((C(1,:)-ub).^2)/N
vbSq=sum((C(2,:)-vb).^2)/N

for i=1:N
     uv(i)=u(i)*v(i)
end

uvb=sum(uv)/N
M=[ubSq uvb;uvb vbSq]
minIgen=min(abs(eig(M)))
MI=[ubSq-minIgen uvb;uvb vbSq-minIgen]
theta=(atan((-MI(1))/MI(2))*180)/pi

thetaRad=(theta*pi)/180
rotMat=[cos(thetaRad)-sin(thetaRad);sin(thetaRad)
        cos(thetaRad)];
%rotate the signature passing the new coordinate
for i=1;N
     v(i)=(C(2,i)*cos(thetaRad))-(C(1,i)*sin(thetaRad))
     u(i)=(C(2,i)*sin(thetaRad))+(C(1,i)*cos(thetaRad))
end
C=[u;v]
for i=1;N
    u(i)=round(u(i)+oub-1)
    v(i)=round(v(i)+ovb-1)
end

mx=0
my=0
if(min(u)<0)
    mx=-min(u)
    for i=1:N
        u(i)=u(i)+mx+1
    end
end
if(min(v)<0)
    my=-min(v)
    for i=1:N
        v(i)=v(i)+my+1
    end
end

C=[u;v]
for i=1:N
    BW3((u(i)),(v(i)))=0
end


xstart=128
xend=1
ystart=128
yend=1

for r=1:128
    for c=1:128
        if((BW3(r,c)==0))
            if(r<ystart)
                ystart=r
            end
            if((r>yend))
                yend=r
            end
            if(c<xstart)
                xstart=c
            end
            if(c>xend)
                xend=c
            end
        end
    end
end

for i=ystart:yend
    for j=xstart:xend
        im((i-ystart+1),(j-xstart+1))=BW3(i,j)
    end
end

 %display result at axes2
 axes(handles.axes2)
  imshow(im)

[Walter Roberson]

Your code ends when I run it.

I recommend that you learn to put a semi-colon on the end of lines that assign into arrays in a loop, as otherwise you display a lot of information to the screen that likely does not need to be displayed at least until the loop finishes.

[Najwa Samlan]

Okay I already put the semicolon but then an error occur:-

Subscript indices must either be real positive integers or logicals.

Error in tetst>pushbutton2_Callback (line 145)

BW3((u(i)),(v(i)))=0;

May I know why this error occur?

[Walter Roberson]

for i=1;N

should be

for i=1:N

[Image Analyst]

Chances are, u(i) or v(i) is zero. See the FAQ.