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Re: MPFIT and initial Guesses [message #87988 is a reply to message #87986]

Mon, 10 March 2014 10:51

steve.kaeppler
Messages: 6
Registered: August 2009

Junior Member

I also have to add that I am wondering about the size of the derivative and how large a parameter can be stepped because as I watch the parameter output from the function, it looks like the functions are changing a very small amount. Example: 1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 999.99999 2842.8501 999.99999 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.4000000 1000.0000 2842.8501 1000.0000 26.000000
1.3784718 1055.2616 2990.1060 1055.2616 21.457859

Notice how the 999.99999 moved very slightly.

Also, why is there this sudden abrupt shift in the last set of variables.

All I am wondering is whether I can get some of these 'initial steps' in the first iteration of the routine to be larger from the start. How do I do that? Does it involve setting the parameter information differently?

Hopefully this helps to clarify things a bit.

Thanks,
Steve

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[Message index]

		MPFIT and initial Guesses By: steve.kaeppler on Mon, 10 March 2014 09:32
		Re: MPFIT and initial Guesses By: wlandsman on Mon, 10 March 2014 10:01
		Re: MPFIT and initial Guesses By: steve.kaeppler on Mon, 10 March 2014 10:51
		Re: MPFIT and initial Guesses By: Phillip Bitzer on Mon, 10 March 2014 14:13
		Re: MPFIT and initial Guesses By: steve.kaeppler on Mon, 10 March 2014 20:01
		Re: MPFIT and initial Guesses By: Craig Markwardt on Mon, 10 March 2014 22:11

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