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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>: A binary brain / background mask. The mask file contains zero in background voxels and non-zero in foreground. The mask may be a NIfTI image or in raw format, if raw it is assumed to be of type "short".
-maskdatatype <char|short|int|long|float|double>: Specifies the type of the mask file; must be big-endian byte ordering. Ignored for NIfTI masks.

AUTHORS

Philip Cook <camino@cs.ucl.ac.uk>

BUGS

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Time: 02:07:11 GMT, December 04, 2017

Axialdistfit