possible to build run-wise xmat from multi-run stimtime files?

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1

Hello gurus

I would like to fit a separate GLM on each scanning run of my experiment. But my stimtime files have all runs concatenated (one run per line, as tradition). Is there a way to build a GLM on each run separately, without generating new stimtime files? That is, is there a way to specify, within the 3dDeconvolve command, the line (run) from which to read stimtime files? (Or some other convenient trick?)

Thanks in advance

2

The most convenient way that comes to mind is to simply script the action of breaking the stim times files into one per run. In such a case, the now empty runs would have asterisks there (one, or maybe two, to be safe).

For example, this one file:

10 20 30 40 50
11 21 31 41 51
12 22 32 42 52

might change into these 3 files:

10 20 30 40 50
* *
* *

* *
11 21 31 41 51
* *

* *
* *
12 22 32 42 52

That shouldn’t be too hard to script. Note that there are multiple ways to extract a specific row from a text file, such as getting row 3 from stim.txt:

awk 'NR == 3 {print}' stim.txt

or

column_cat -line 3 stim.txt
  • rick