Talk:Test functions for optimization

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Townsend constraints

The reference says to constrain inside the curve defined by:

t = chebfun('t',[0,2*pi]);
x = 2*sin(t); y = 2*cos(t)-(1/2)*cos(2*t)-(1/4)*cos(3*t)-(1/8)*cos(4*t);

If you plug in t = 1, you get a point at (1.68, 1.62). Wikipedia's version says:

t = Atan2(y/x)

If you plug in x = 1.68, y = 1.62, you get t = 0.766, which does not match the original t. So I think this is incorrect. — Omegatron (talk) 05:00, 7 September 2017 (UTC)[reply]

The plot provided is for the constrains as stated. I added the note "(modified)" after the function name, and removed the "dubious" flag. Pasimi (talk) 23:32, 9 December 2017 (UTC)[reply]