how would i plot upper half of an ellipse in matlab using standar form?

(x^2/a^2) + (y^2/b^2) = 1

Answer 1

[Mischa Kim]

With a bit of math, solve for y

 a = 2; b = 3;
 x = -a:0.1:a;

 y = sqrt(b^2 - b^2*(x.^2/a^2));
 plot(x,y)