# Differences

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optimization-parameter-scaling [2017/11/13 10:39] awf |
optimization-parameter-scaling [2017/11/13 10:43] (current) awf |
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But if you add 1e-5 seconds, it will probably change the objective by very little, maybe by 1e-12 gigawatts, and the optimizer will be in trouble. | But if you add 1e-5 seconds, it will probably change the objective by very little, maybe by 1e-12 gigawatts, and the optimizer will be in trouble. | ||

- | Your days were a better choice (about 86400 times better), giving a change of 1e-7 GW when you add 1e-5 days (about a second). | + | Your first idea (do it in days) was actually a better choice (about 86400 times better), giving a change of 1e-7 GW when you add 1e-5 days (about a second). Can we do even better? |

- | Ultimately you're probably anyway looking at terms in the objective which include the phase of the moon as | + | Well, look at how the parameter appears in the objective funciton. phase of the moon, that's normally in some term like: |

- | cos(eta * phoon)^beta | + | $$ \cos(\eta * \mathtt{phoon})^\beta $$ |

- | so perhaps a range of 0..1/eta is sensible. | + | so a sensible range might be 0 to $2\pi/\eta$. |

- | The point is just to think about how a change in phoon affects the objective. | + | The point is just to think about how a change in ''phoon'' affects the objective. |

=== But that's the easy case, what about dimensionless parameters? === | === But that's the easy case, what about dimensionless parameters? === |