function A=tripletrialfunc(x,y,z)
%Assume vector x and scalars y and z
%

%See if (x,y,z) is in the correct region.  If not, return 0.
N=length(x);
for j=1:N
  flag=0;
    if x(j)<=2 & x(j)>=-2
      if y>=x(j)^2 & y<=4
          if abs(z)<=sqrt(y-x(j)^2)
              flag=1;
          end
      end
    end
  if flag==0 
      A(j)=0;
  else
      A(j)=sqrt(x(j).^2+z.^2);
  end
end