I managed to crash fityk using domains on fitting params

[tzo...@physics.uoc.gr]

Hi I was trying to add some limits to the values the fitting parameters could take using the [:] option. 

The following statement makes fityk crash.

%g2S  = GaussianA(height=~300, center=75, area=~11174, hwhm=~6.3[0:10])

while the same without the [0:10]

%g2S  = GaussianA(height=~300, center=75, area=~11174, hwhm=~6.3)

or without the ~ but keeping the [0:10] 

%g2S  = GaussianA(height=~300, center=75, area=~11174, hwhm=6.3[0:10])

both work even though there is a complaint on syntax error.

Not sure why, but I guess a good program should NOT be allowed to crash. So this can probably be fixed?

I'm not sure what I'm doing wrong. All I wanted is to have hwhm be allowed to vary in the interval [0:10] and this option is explained in the manual in the section of Domains

I also could not find anything on  how to use the domain_percent option. Could somebody show me a working example of both [:] and domain_percent?

Thanks

[Marcin Wojdyr]

Yes, it's a bug. Hopefully I've just fixed it.

As a workaround you could do the same in two steps:
%g2S = GaussianA(center=75, area=~11174, hwhm=~6.3)
%g2S.hwhm = ~6.3[0:10]

Domains are respected only by some fitting methods. In particular they
are _not_ respected by the default fitting method. This will be
changed in the future.

Some fitting methods, such as Nelder-Mead, need to know a domain for
each parameter. Because they generate a random set of possible values
for each parameters. Since Fityk in most of cases doesn't have such
information we use assume arbitrarily that the domain is +/- 30% of
the current value. Option domain_percent can change the percentage.

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