I just brought up gifeffit this morning -- and I can already say I like it. I was wondering about some simple changes (perhaps I can do some of these myself once I get a little more sophisticated) 1. It would be nice to have legends on the pgplot window -- colors are nice but if one is comparing different data sets, it is really hard to tell them apart (especially if the page is printed). Also one of the things I used to do with the unix environment was to set up a series of different autobak files with different rback settings so I could see the effect of moving the fit window. It was nice to be able to compare all of these in the same graphic window -- it doesn't seem like this can be done anymore (am I right about this?) 2. In terms of documentation, a nice intro would be to highlight the differences between gifeffit and the more traditional unix command line version to help new users get up to speed -- again I am willing to write some of this (if help is needed), but I still need to get up to speed myself! 3. I am not 100% sure of this, but it seemed that when, for example, I had the plotter open and subsequently read in a new data set in another window or defined a new array, the pop-up menus in the plotter window weren't aware of the new data set (at least not immediately). One last thing, on the ifeffit homepage, it is stated that feffit is included in the distribution, but is not stable -- what is unstable and what are the limitations of the feffit module within gifeffit currently, e.g. is it something I can use to fit data? Last thing -- but really should have been first. Thank you for putting all of this effort into ifeffit and then sharing it with the rest of the community. Many people are benefiting from your efforts. Bruce's course (which is still a developing entity I believe) is also of great help in learning more about the different approaches to data analysis. It is my impression that while there is a fairly good collection of knowledge regarding exafs (and less so for xanes), this information is scattered in many different locations (and some of it is very dated). Having a reference in a easy-to-find place is a real benefit to the community at large. It also would have the advantage of being dynamic in that it doesn't have the birth (and death) cycles of commercially published material. I guess all of this is obvious, but I just wanted to say thanks (again). Paul
Hi Paul, Thanks for all the comments and kind words!
1. It would be nice to have legends on the pgplot window -- colors are nice but if one is comparing different data sets, it is really hard to tell them apart (especially if the page is printed). Also one of the things I used to do with the unix environment was to set up a series of different autobak files with different rback settings so I could see the effect of moving the fit window. It was nice to be able to compare all of these in the same graphic window -- it doesn't seem like this can be done anymore (am I right about this?)
Both excellent suggestions, and not hard to do. The 'key' keyword in the plot command will give a 'gnuplot-like' plot legend: plot(dat.x, dat.y, key='Data #1') Using that, a plain-old macro that changes rbkg might look like this: macro try_rbkg in_group out_group 1.00 spline($1.energy, $1.xmu, kweight=1, rbkg=$3, group=$2) $2.chik = $2.chi * $2.k^2 plot($2.k, $2.chik, key=$2) end macro read_data(my.xmu, group=dat,type=xmu) try_rbkg my r05 0.5 try_rbkg my r07 0.7 try_rbkg my r09 0.9 try_rbkg my r11 1.1 Making a GUI form to show rbkg from [..] to [..] in steps of [..] would be simple and useful. I'll try to get this in the next version.
2. In terms of documentation, a nice intro would be to highlight the differences between gifeffit and the more traditional unix command line version to help new users get up to speed -- again I am willing to write some of this (if help is needed), but I still need to get up to speed myself!
OK... yes any suggestions or help writing such documentation would be greatly appreciated!!
3. I am not 100% sure of this, but it seemed that when, for example, I had the plotter open and subsequently read in a new data set in another window or defined a new array, the pop-up menus in the plotter window weren't aware of the new data set (at least not immediately).
Yes, this is annoying. Clicking on a 'dropdown list of groups' should show the complete list. Currently it shows the last-known list and _then_ gets the latest list, so it's easy to get a step behind. I'll try to fix it.
One last thing, on the ifeffit homepage, it is stated that feffit is included in the distribution, but is not stable -- what is unstable and what are the limitations of the feffit module within gifeffit currently, e.g. is it something I can use to fit data?
The feffit() command within ifeffit is OK (well, as far as I know!). The message was about the Feffit Program that is included with the ifeffit distribution kit. This is still based o a fairly different set of source code, though I'm trying to fully merge the two. Because of problems with this merger, there were some serious problems with the Feffit program. I think these are worked out now, so that the Feffit program that installs with ifeffit is now as good as the 'old feffit program'. --Matt
participants (2)
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Dr. Paul Fons -
Matt Newville