Hi,
Thanks. i figured out both of the problems. The 256/257 is a problem with readafni function in R. using 3dbrickstat i get 0 and 1. The other problem i was facing was regarding different results for HEAD and BRIK, that was again due to running with R. In one of them i accidently put the code in 2 lines which introduced a \n operator and that made the difference
Sorry for the confusion.
Thanks,
Prateek Sasan
