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faster minimization needed - maybe mpfit? [message #79653]

Mon, 26 March 2012 06:15

rogass
Messages: 200
Registered: April 2008

Senior Member

Hi folks,
the following expression runs successfully with AMOEBA but requires
for large matrices (columns < 512, rows up to 30000), for small
tolerances (e.g. ftol=1e-06) and a high number of iterations
(nmax>=10000) to converge years:

expr = total(abs(convol(im-rebin(p[*],size(im,/dim),/samp),
[-1.,0.,1.])))

where p is the parameter vector (one row) to be found and im is the
matrix.

Is there a way to do it faster? Maybe with mpfit (I don't get an idea
how...)

Thanks for any help

CR

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[Message index]

		faster minimization needed - maybe mpfit? By: rogass on Mon, 26 March 2012 06:15
		Re: faster minimization needed - maybe mpfit? By: Craig Markwardt on Tue, 27 March 2012 06:38
		Re: faster minimization needed - maybe mpfit? By: rogass on Wed, 28 March 2012 23:45
		Re: faster minimization needed - maybe mpfit? By: rogass on Tue, 27 March 2012 05:28
		Re: faster minimization needed - maybe mpfit? By: Craig Markwardt on Mon, 26 March 2012 15:36
		Re: faster minimization needed - maybe mpfit? By: rogass on Mon, 26 March 2012 12:59
		Re: faster minimization needed - maybe mpfit? By: Craig Markwardt on Mon, 26 March 2012 12:04

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