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Debugging fitting data and empty plot

Sahrawi Chaib, Tokyo Inst. Tech
Posted 5 months ago

My code is not executing the fitting command and return an empty plot. Appreciate any pointers. Thanks
POSTED BY: Sahrawi Chaib
4 Replies
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Starting points are entered like this:

NMinimize[{x^2 + (y - .5)^2, y >= 0 && y >= x + 1}, {{x, stargingPointX},{y,startingPointY}}]
POSTED BY: Gianluca Gorni

You are using the syntax of FindMinimum in NMinimize.

NMinimize does not use starting points.
POSTED BY: Gianluca Gorni

Here is a simple code that uses "starting points" NMinimize[{x^2 + (y - .5)^2, y >= 0 && y >= x + 1}, {x, y}]
POSTED BY: Sahrawi Chaib

Below shows a simple example of how to specify "starting points" in NMinimize[]. The methods used by NMinimize[] usually need several starting points, at least n+1, where n is the number of variables.

NMinimize[{x^2 + (y - .5)^2, y >= 0 && y >= x + 1}, {x, y}, 
 Method -> {Automatic, "InitialPoints" -> {{0, 1}, {0, 4}, {2, 4}}}]

I believe NMinimize[] will add extra points if needed. A specific method instead of Automatic may be used.
POSTED BY: Michael Rogers
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