I can second Isaac's comment, but let's make sure of
the exact command that you are running. Would you
please show it? I thought this was after running
3dAutoTcorrelate, but I guess it is before.
If you cannot run 3dcalc on this dataset, the 3dAutoTcorrelate
will surely not work, but maybe it will be enough to use 3ddot
on specific pairs.
In any case, what is your current command? If you are
running out of RAM, please consider closing other big
users of RAM, such as Office programs, or even browsers.
- rick