afni.nimh.nih.gov

Hi, I'm wondering how to select a variable bucket. Each subject has a variable last bucket depending on how many times they responded correctly to a stimulus type. I can set a $last_bucket variable for each subject, but that variable is not recognized in the context of selecting a range of buckets, such as:

3dbucket -prefix BN100_Fear_Betas CtxEGNG_BlockCue_IM_GAM_BN100_bucket+tlrc.BRIK.gz'[10..${fear_end_bucket}(2)]'

Is there a way to do this simply?

Thank you,
Michael