How plot slope from lower point on image to last point .When I apply my code ,its not draw to end point in image

this part of code

for k=1:300
    for j=1:300
        if (j==300) &&(BWw(k,j)==1)
         row1=k;
         column1 = j;
         end
    end
end

%%%%%%%%%%%%%%%%%
plot( [row column],[row1 column1],'Color','r','LineWidth',3);

Answer 1

[KSSV]

I = imread('image.png') ; 

[m,n,p] = size(I) ; 

imshow(I) ; 
hold on
plot([1 m],[n 1],'b')

[Ruba Talal]

Thank you very much .its worked

[KSSV]

Thanks is accepting/ voting the answer. :)

[Ruba Talal]

please I want draw line from first white point to last white point .