Hi folks, As Matt suggested, I will take a stab at this question.
I had a question I was hoping you could help me with. I have imported a bunch of ASCII type files into Athena and averaged them all together. The ASCII files contain the Energy, detector file, I0, I1, and I2. After I average the files together, I want to save the file and export it as an ASCII file. I understand how to do this, but when I do it I only obtain the Energy, [detector/IO], and background in column three (like it states in the manual). Now what I want to do, is extract the averaged I0 column from the process. Is there anyway to do this or will I just have to average I0 in another software. Any help with this would be appreciated.
I believe you'd have to average all the I0 values yourself, and that athena cannot do this easily. Bruce might correct me on this.... It would be possible to do this using the Ifeffit commands directly (including in the athena command window), something like this:
Matt's suggeted sequence of raw ifeffit commands is certainly a fine way of doing what Jacob asked for. Averaging I0 alone is not something I had in mind when I designed Athena's basic interface features, but it should be possible. As is the case when one tries to explain a sequence of mouse clicks, this will be rather wordy. Sorry.... As all Athena users know, the first thing that happens when you import a data file is to interact with the file selection dialog: http://leonardo.phys.washington.edu/~ravel/software/exafs/images/athena/colu... Athena remembers which columns were used to make the numerator and denominator of the expression that constructs mu(E) from the column data. (Note that the ability to make detector groups is lost once the data are saved to a project file. Making detector groups is something that must be done during the session in which the raw data are imported.) In the Group menu is a option for "Make detector groups". This will make entries in the Data groups list for the numerator and denominator used to make the original data group. So my solution to Jacob's problem was to import data files one-by-one. Each time, I made the detector groups. Once all the data was imported and the detector groups were made, I marked the denominator groups (my test data were all transmission, so I0 was in the denominator). Then, in principle, one could select "Merge marked data in mu(E)" from the Merge menu and have the merged I0 data that Jacob was looking for. *In principle*. In fact, there is a bug in the current version of Athena and the merge of the I0 data failed. That bug will, however, be fixed soon. Once that is done, it will be possible, albeit inconvenient, to merge I0 data as Jacob wants. You may wish to try working through the procedure that I described to understand how the detector group feature of Athena works, even if the final step will fail in the current version. B P.S. I am pretty certain that this will be fixed in time for the next release of Athena and that the next release will be before Friday the 11th. -- Bruce Ravel ----------------------------------- ravel@phys.washington.edu Code 6134, Building 3, Room 222 Naval Research Laboratory phone: (1) 202 767 5947 Washington DC 20375, USA fax: (1) 202 767 1697 NRL Synchrotron Radiation Consortium (NRL-SRC) Beamlines X11a, X11b, X23b, X24c, U4b National Synchrotron Light Source Brookhaven National Laboratory, Upton, NY 11973 My homepage: http://feff.phys.washington.edu/~ravel EXAFS software: http://feff.phys.washington.edu/~ravel/software/exafs/