Increase the incline of the ground

Hi,

I am working on a project which is to calculate and track the centre of gravity of the aircraft and I am using the following Function to workout centre of gravity in the Y direction.

function ans = findycog(pmap,pw,lw)

 totalweights = pw + lw;
 tmp = 0.0;
 cordplane = zeros(30,7);
 cordplane = double(cordplane);
    for i = 1:30
  cordplane(i,:) = 5.07 + (24.57/30.0)*(i-1);
    end
 if((sum(sum(totalweights))) ~= 0.0)
     tmp = sum(sum(cordplane.*(totalweights)))/double((sum(sum(totalweights))));
 else
     tmp = ((cordplane(15,1) + cordplane(12,1))/2);  ;  
 end    
 ans = tmp;
 end

Now I want to increase the incline of the ground, WHAT DO I NEED TO ADD TO THE FUNCTION TO MAKE IT 2 DEGREE INCLINE.

Any help would be nice. Thanks