nested for loop assigning to a matrix

Hi I'm having trouble having all the outputs of this for loop assigned to a matrix, it is only assigning the last run. I'm trying to find the solar absorption when the cloud cover(nc) is 0, at the latitude(lat) 0.

day=365; hr=24; abs_sun_rad= nan(day,hr);

for days = 1:day;

     for hrs=0:hr; 
         sec= hrs*3600;

         del = -23.45*(pi/180)*(cos((2*pi/365)*(days+9)));
            S=1357+45*(cos(((2*pi)/86400)*days));

        sin_h =(sind(lat)*sind(del)+ cosd(lat)*cosd(del)*cosd((2*pi/86400)*(sec+43200)));

        h=asin(sin_h);
        m=(1/sin_h);
        Cext=0.128-0.0235*(log(m));

        i=((pi/2)-h);
        j=asin(0.75*(sin(i)));
        r=(0.5)*(abs((sin(i-j).^2)/(sin(i+j).^2)+(tan(i-j).^2/tan(i+j).^2)));

            if h>0 ;         
                Insd=S*(exp(-Cext(:,1)*m))*(sin_h*(1-0.71*nc));
            end
            if h<=0;
                Insd=0;
            end

        Insg = 0.52*nc*Insd(:,1);
        abs_sun_rad(day,hr)=Insd*(1-r)+0.97*(Insg);
     end 
end

any help is great appreciated thanks

Answer 1

[Chad Greene]

It looks like you're assigning abs_sun_rad(day,hr)=Insd..., but day and hr are scalar values that do not change. Perhaps you mean abs_sun_rad(days,hrs+1)=Insd...