Usage: 3dEmpty [options]
Makes an 'empty' dataset .HEAD file.
Options:
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-prefix p = Prefix name for output file (default = 'Empty')
-nxyz x y z = Set number of voxels to be 'x', 'y', and 'z'
along the 3 axes [defaults=64]
*OR*
-geometry m = Set the 3D geometry of the grid using a
string 'm' of the form
'MATRIX(a11,a12,a13,a14,a21,a22,a23,a24,a31,a32,a33,a34):nx,ny,nz'
which defines the number of grid points, as well as
relationship between grid indexes (voxel centers)
and the 3D xyz coordinates.
* Sample 'MATRIX()' entries can be found by using
program 3dinfo on an existing datasets.
* Each .niml file used by 3dGroupInCorr has a
'geometry="MATRIX(...)" entry.
-nt = Number of time points [default=1]
* Other dataset parameters can be changed with 3drefit.
* The purpose of this program (combined with 3drefit) is to
allow you to make up an AFNI header for an existing data file.
* This program does NOT create data to fill up the dataset.
* If you want to create a dataset of a given size with random
values attached, a command like
3dcalc -a jRandomDataset:32,32,16,10 -expr a -prefix Something
would work. In this example, nx=ny=32 nz=16 nt=10.
(Changing '-expr a' to '-expr 0' would fill the dataset with zeros.)
++ Compile date = Oct 31 2024 {AFNI_24.3.06:linux_ubuntu_24_64}
