MATLAB: I’m getting the streamlines only in the lower right and not in the upper left area.

streamline

CODE:
clc
clear all
lh=input('Enter the value of L/H ');
n2=input('Enter the value of N2 ');
re=input('Enter the value of Re ');
dt=input('Enter the value of dt ');
dx=input('Enter the value of dx ');
dy=input('Enter the value of dy ');
hd=input('Enter the value of H/d ');
e=input('Enter the stopping criteria ');
m=((lh*hd)/dx)+1;
n=(hd/dy)+1;
n1=n-n2;
v0=zeros(m,n);
v=zeros(m,n);
s0=zeros(m,n);
s=zeros(m,n);
v_v=zeros(m,n);
v_u=zeros(m,n);
it=1;
count=0;
e1=ones(m,n);
e2=ones(m,n);
e3=10;
while any(e1(:) > e) | any(e2(:) > e)
    count=count+1;
    dt1=it*dt;
    it=it+1;
    
c1=1/((1/dt1)+((2/re)*((1/(dx*dx))+(1/(dy*dy)))));
c2=1/(2*((1/(dx*dx))+(1/(dy*dy))));
for j=2:n1
    s(1,j) = -1;
end
for j=n1+1:n
    v(1,j) = 0;
    s(1,j) = ((j-1)*dy)-(hd);
end
for i=2:m-1
    s(i,1) = -1;
end
for j=2:n2
    s(m,j) = ((j-1)*dy)-1;
    v(m,j) = 0;
end
for j=n2+1:n
    s(m,j) = 0;
end
for i=2:m-1
    s(i,n) = 0;
end
    for i=2:m-1
        for j=2:n-1
            v(i,j) = c1*((v0(i,j)/dt1)-(v0(i,j+1)/(dy*dy))-(v0(i,j-1)/(dy*dy))+(v0(i+1,j)/(re*dx*dx))+(v0(i-1,j)/(re*dx*dx)));
            s(i,j) = c2*(((s0(i+1,j)+s0(i-1,j))/(dx*dx))+((s0(i,j+1)+s0(i,j-1))/(dy*dy))+v0(i,j));
        end
    end
    
    for j=2:n1
        v(1,j) = -2*((s0(2,j)-s0(1,j))/(dx*dx));
    end
    
    for i=2:m-1
        v(i,1) = 2*((s0(i,1)-s0(i,2))/(dy*dy));
    end
    
    for j=n2+1:n
        v(m,j) = -2*((s0(m-1,j)-s0(m,j))/(dx*dx));
    end
    
    for i=2:m-1
        v(i,n) = 2*((s0(i,n)-s0(i,n-1))/(dy*dy));
    end
    
    for i=1:m
        for j=1:n
            e1(i,j)=abs(v(i,j)-v0(i,j));
            e2(i,j)=abs(s(i,j)-s0(i,j));
            v0(i,j)=v(i,j);
            s0(i,j)=s(i,j);
        end
    end
    
    end
   
fprintf ('\n Iterations = %d \n \n',count)
disp (v)
disp (s)
for j=1:n1
    v_v(1,j) = 0;
    v_u(1,j) = 0;
end
for j=n1:n
    v_v(1,j) = 0;
    v_u(1,j) = 1;
end
for i=2:m-1
    v_v(i,1) = 0;
    v_u(i,1) = 0;
end
for j=1:n2
    v_v(m,j) = 0;
    v_u(m,j) = 1;
end
for j=n2:n
    v_v(m,j) = 0;
    v_u(m,j) = 0;
end
for i=2:m-1
    v_v(i,n) = 0;
    v_u(i,n) = 0;
end
for i=2:m-1
    for j=2:n-1
        
        v_u(i,j) = (s(i,j+1)-s(i,j-1))/(2*dy);
        v_v(i,j) = (s(i-1,j)-s(i+1,j))/(2*dx);
    end
end
disp (v_u)
disp (v_v)
figure (1);
plot (v_u);
figure (2);
plot (v_v);
startx=[1:1:m];
starty=[1:1:n];
figure (3);
quiver(v_u,v_v);
streamline(v_u,v_v,startx,starty);
I'm using streamline in this code and I'm getting this figure. I'm getting the streamlines only in that area and not in the upper left area.
lh=1, 
n2=5  
re=1  
dt=0.1  
dx=0.5  
dy=0.5  
hd=10  
e=0.000001
Also, in some cases, I have to use lh=0.5 and 2. Then I'm getting this error:
Error using stream2 (line 49)
STARTX,STARTY must all be the same size.
Error in streamline (line 60)
verts = stream2(u,v,sx,sy,options);
Error in Copy_of_final (line 153)
streamline(v_u,v_v,startx,starty);
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