how to assign a particular value and show it on a intersection point

axis([0 4 0 5])
for i=1:n
    for j=1:m
        mapshow(i,j,'Marker','*')
    end
end

[Devineni Aslesha]

Give more elaboration to your question so that it helps me to provide you an appropriate answer. Also, try to explain on what you are trying to do with the above code.