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Manpage of axialdistfit
axialdistfit
Section: User Commands (1)
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NAME
axialdistfit - Fits an axial PDF to sets of axes.
SYNOPSIS
axialdistfit -pdf <pdftype> [-outputpicoformat] [-evecs
<theta_1 phi_1 theta_2 phi_2 theta_3 phi_3>]
[-vectorspervoxel <num>] [-bgmask <mask>]
DESCRIPTION
Fits an axial distribution to some vector data. The output is the parameters of the
Bingham, Watson, or ACG distribution fitted to the data. Either the
concentration parameters alone, or the complete PDF in the format of
picopdfs (see picopdfs(1)) may be outputted.
The input data should be cartesian vectors in raw binary format: [x y z x
y z...x y z].
EXAMPLES
Fit the concentration parameters of the Bingham distribution to a set
of axes in the file test/axes.Bdouble, and send the concentration
parameters to stdout as text
axialdistfit < test/axes.Bdouble | double2txt
Fit the parameters and output the eigenvectors of the PDF as well as
the concentration.
axialdistfit -outputpicoformat < test/axes.Bdouble > picopdf.Bdouble
OPTIONS
- -pdf <bingham | watson | acg>
-
Specifies the PDF to fit to the data. Default is Bingham.
- -outputpicoformat
-
Output the entire PICo PDF, including the eigenvectors of the
distribution. See picopdfs(1).
- -evecs <theta_1 phi_1 theta_2 phi_2 theta_3 phi_3>
-
When specified with -outputpicoformat, outputs the specified
eigenvectors instead of the eigenvectors of the scatter matrix of the samples.
- -vectorspervoxel <num>
-
If this is specified, the program fits the axial distribution to blocks of num vectors.
By default, all the vectors in the input are considered to be a single unit.
- -bgmask <Mask file>
-
Provides the name of a file containing a background mask computing
using, for example, FSL's bet2 program. The mask file contains zero
in background voxels and non-zero in foreground. The mask must be big
endian; the default data type is 16-bit shorts, but can be changed
using the -maskdatatype option. The program outputs zeros for
background voxels.
- -maskdatatype <char|short|int|long|float|double>
-
Specifies the type of the mask file; must be big-endian byte ordering.
AUTHORS
Philip Cook <camino@cs.ucl.ac.uk>
SEE ALSO
picopdfs(1)
BUGS
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- EXAMPLES
-
- OPTIONS
-
- AUTHORS
-
- SEE ALSO
-
- BUGS
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