The JAM Exam
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Examination to become a Jedi AFNI Master (the next step above ACE).
Not completed yet
- What does the command below do?
afni -dset "v1+orig<`3dClipLevel 'v1+orig[4]'`..10000>"
Explain the use of the 3 different kinds of quotes. - Suppose you have two 1-brick datasets aaa+orig and bbb+orig, and want to extract from a 3D+time dataset xxx+orig the average time series over all voxel where BOTH aaa+orig and bbb+orig are bigger than 3 (i.e., a conjunction test). Explain how to do this in a single command.
- The 'Rota' arrow buttons on the 'Define Overlay' control panel rotate the color bar. How can you save a movie (animated GIF or MPEG-1) of the changes that happen in an AFNI image viewer as the color overlay changes while you interactively press one of the Rota buttons?
- In an AFNI image viewer, you can both crop and zoom an image. What happens when you 'Save' such an image to disk (e.g., in a JPEG file)? Is it cropped, zoomed, both, or neither?
- In an AFNI graph viewer, you can filter the time series in each voxel using the 'Tran 1D' transformation functions. One of these pre-programmed filters is a "Median-of-3" filter. How can you do a "Median-of-7" filter instead? (Without writing new C code.)
- How can you make the color overlay be computed from the square root of an F-statistic sub-brick, rather than the F-statistic value itself? (Interactively; that is, without using 3dcalc.)
The following questions are only for those who will be turning to the Dark Side of the AFNI (i.e., Sith Program Masters):
- If you sneak into someone's account and create a file in their home directory named .afni.startup_script whose content is one line of text reading
TRACE YES
what will the effect be on their ability to use AFNI? - What is special about the date 7 September in the AFNI interface?
- How can you make the AFNI .HEAD file be stored in an XML format? (Bonus: Why be so evil?)
