How to convert loop code to loopless

     for i=0:pi/180:2*pi
         x=round(row+radius*cos(i));
         y=round(col+radius*sin(i));
         if(x>0 && y>0 && x<m && y<n)
             A(x,y)=1;
         end
     end

[Stephen23]

What are the size and class of row, radius, col, m, n, and A?

In order to be able to run your code you need to post a complete working example, not just the part that you think is interesting.