AFNI program: 3dTcat

Concatenate sub-bricks from input datasets into one big 3D+time dataset.
Usage: 3dTcat options
where the options are:
     -prefix pname = Use 'pname' for the output dataset prefix name.
 OR  -output pname     [default='tcat']

     -session dir  = Use 'dir' for the output dataset session directory.
                       [default='./'=current working directory]
     -glueto fname = Append bricks to the end of the 'fname' dataset.
                       This command is an alternative to the -prefix 
                       and -session commands.                        
     -dry          = Execute a 'dry run'; that is, only print out
                       what would be done.  This is useful when
                       combining sub-bricks from multiple inputs.
     -verb         = Print out some verbose output as the program
                       proceeds (-dry implies -verb).
                       Using -verb twice results in quite lengthy output.
     -rlt          = Remove linear trends in each voxel time series loaded
                       from each input dataset, SEPARATELY.  That is, the
                       data from each dataset is detrended separately.
                       At least 3 sub-bricks from a dataset must be input
                       for this option to apply.
             Notes: (1) -rlt removes the least squares fit of 'a+b*t'
                          to each voxel time series; this means that
                          the mean is removed as well as the trend.
                          This effect makes it impractical to compute
                          the % Change using AFNI's internal FIM.
                    (2) To have the mean of each dataset time series added
                          back in, use this option in the form '-rlt+'.
                          In this case, only the slope 'b*t' is removed.
                    (3) To have the overall mean of all dataset time
                          series added back in, use this option in the
                          form '-rlt++'.  In this case, 'a+b*t' is removed
                          from each input dataset separately, and the
                          mean of all input datasets is added back in at
                          the end.  (This option will work properly only
                          if all input datasets use at least 3 sub-bricks!)
                    (4) -rlt can be used on datasets that contain shorts
                          or floats, but not on complex- or byte-valued
                          datasets.

Command line arguments after the above are taken as input datasets.
A dataset is specified using one of these forms:
   'prefix+view', 'prefix+view.HEAD', or 'prefix+view.BRIK'.

SUB-BRICK SELECTION:
You can also add a sub-brick selection list after the end of the
dataset name.  This allows only a subset of the sub-bricks to be
included into the output (by default, all of the input dataset
is copied into the output).  A sub-brick selection list looks like
one of the following forms:
  fred+orig[5]                     ==> use only sub-brick #5
  fred+orig[5,9,17]                ==> use #5, #9, and #12
  fred+orig[5..8]     or [5-8]     ==> use #5, #6, #7, and #8
  fred+orig[5..13(2)] or [5-13(2)] ==> use #5, #7, #9, #11, and #13
Sub-brick indexes start at 0.  You can use the character '$'
to indicate the last sub-brick in a dataset; for example, you
can select every third sub-brick by using the selection list
  fred+orig[0..$(3)]

NOTES:
* The TR and other time-axis properties are taken from the
  first input dataset that is itself 3D+time.  If no input
  datasets contain such information, then TR is set to 1.0.
  This can be altered using the 3drefit program.

* The sub-bricks are output in the order specified, which may
  not be the order in the original datasets.  For example, using
     fred+orig[0..$(2),1..$(2)]
  will cause the sub-bricks in fred+orig to be output into the
  new dataset in an interleaved fashion.  Using
     fred+orig[$..0]
  will reverse the order of the sub-bricks in the output.
  If the -rlt option is used, the sub-bricks selected from each
  input dataset will be re-ordered into the output dataset, and
  then this sequence will be detrended.

* You can use the '3dinfo' program to see how many sub-bricks
  a 3D+time or a bucket dataset contains.

* The '$', '(', ')', '[', and ']' characters are special to
  the shell, so you will have to escape them.  This is most easily
  done by putting the entire dataset plus selection list inside
  single quotes, as in 'fred+orig[5..7,9]'.

* You may wish to use the 3drefit program on the output dataset
  to modify some of the .HEAD file parameters.