Replace specific rectangular regions with ones

I wanted to fill the rectangular positions in bbox (values attached in order - [x y width height]) with ones.

I tried the below code, but i dont get any white regions, what can be the reason?

mask = zeros(300,950);
load bbox
for i = length(bbox)
    mask(bbox(i,1) : bbox(i,3) , bbox(i,2) : bbox(i,4)) = 1;
end
figure, imshow(mask);

[Johannes Hougaard]

I don't think you can index using e.g. 31.5 as your index.

Indices must be integers.

[Ben McMahon]

Your loop is currently only setting the counter to the final value. To loop over all i in a set use the : notation. For example:

for i = 1:length(bbox)
    mask( bbox(i,1) : bbox(i,3) , bbox(i,2) : bbox(i,4) ) = 1;
end

[Elysi Cochin]

yes, thank you sir

Answer 1

[KSSV]

mask = zeros(30,95);
load bb.mat
bbox = round(bb) ;
for i = length(bbox)    
    row1 = ceil(bbox(2));
    row2 = row1 + bbox(3);
    column1 = ceil(bbox(1));
    column2 = column1 + bbox(4);
    mask(row1:row2,column1:column2) = 1;
end
figure, imshow(mask);