Talk:Test functions for optimization: Difference between revisions

Revision as of 13:18, 19 March 2013

Revision as of 05:00, 7 September 2017

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{{maths rating|field=analysis|priority=low|class=Start}}

== Townsend constraints ==

[http://www.chebfun.org/examples/opt/ConstrainedOptimization.html The reference] says to constrain inside the curve defined by:

<pre>

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);

</pre>

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. — [[User:Omegatron|Omegatron]]&nbsp;([[User talk:Omegatron|talk]]) 05:00, 7 September 2017 (UTC)