Re: [task #7860] When dx_map is issued, create a parameter file which maps parameters to chi2 value. -- October 10, 2014 - 16:53

Hi,

Then I would suggest something much more powerful!  The dx.map user
function is currently only for 3 dimensions or parameters, so it is
rather useless for looking for a global minimum if the parameter
values of the other dimensions are not set to the values of that
unknown minimum!

I would therefore suggest a much, much more powerful user function
that will be very quick for you to implement.  It could be called
maybe the minimise.grid_map or minimise.map_space user function.  You
can create this by simple duplication of the minimise.grid_search user
function code, but just add a new argument for an output text file.
Then you set up your target function and loop over the parameter space
yourself (by first creating a massive parameter grid) and then calling
the target function and placing the returned chi2 value into the text
file.  As your dimensions are not limited - though you could extend it
so you only use a subset of parameters just as in the dx.map user
function - you will be able to see much more of the space.  Is this
what you would be after?

Regards,

Edward


On 10 October 2014 14:50, Troels Emtekær Linnet <tlinnet@xxxxxxxxxxxxx> wrote:
> Hi Edward.
>
> The reason I am looking into this, is that I maybe have some maps which
> shows that relax did not find the global minimum.
>
> So, I look into my data, and will create the files for inspection.
>
> Best
> Troels
>
> 2014-10-10 14:33 GMT+02:00 Edward d Auvergne
> <NO-REPLY.INVALID-ADDRESS@xxxxxxx>:
> > Follow-up Comment #2, task #7860 (project relax):
> >
> > Using the 'map_type', and adding a new section 'plain text', then this
> > could
> > be extended to map out 4, 5, or much higher dimensions as well.  This
> > could
> > almost be a new user function though, as half of the dx.map user function
> > options will not be used.
> >
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