I think this is what you were asking.
In place of xCenter and yCenter, you can choose what ever the values that you want.
Similarly, the limits of xRadius and yRadius is of your choice.
xCenter = 0;
yCenter = 0;
xRadius = 1.41631:-(1.41631)/100:0;
yRadius = 0.53:-(0.53)/100:0;
theta = 0 : (2*pi)/100 : 2*pi;
x(i,j) = xx * cos(theta(j)) + xCenter;
y(i,j) = yy * sin(theta(j)) + yCenter;
plot(x, y, 'LineWidth', 3);