calcODF

PDF to ODF inversion

calcODF is one of the main function of the MTEX toolbox. It estimates an ODF from given Polefigure intensities by fitting an ODF that consists of a large number of unimodal ODFs to the data. It does so by minimizing a least squares functional. The command calcODF supports automatic ghost correction and the zero range method. The function calcODF has several options to control convergence, resolution, smoothing, etc. See below for a complete description.

Syntax

odf = calcODF(pf)
odf = calcODF(pf,'halfwidth',5*degree)
odf = calcODF(pf,'zeroRange')
odf = calcODF(pf,'resolution',2.5*degree)

pf

param,val

Parameters and values that control calcODF

Parameter	Description
`'kernel'`	the ansatz functions (default = de la Vallee Poussin)
`'halfwidth'`	halfwidth of the ansatz functions (default = 2/3 * resolution)
`'resolution'`	localization grid for the ansatz fucntions (default = 3/2 resolution(pf))
`'iter_max'`	maximum number of iterations (default = 11)
`'iter_min'`	minimum number of iterations (default = 5)
`'c0'`	initial guess (default = [1 1 1 1 ... 1])

param

Options that control the calcODF behavior

Parameter	Description
`'zeroRange'`	apply zero range method (default = )
`'noGhostCorrection'`	omit ghost correction
`'ensure_descent'`	stop iteration whenever no procress if observed
`'force_iter_max'`	allway go until ITER_MAX
`'silent'`	no output

`odf`	reconstructed ODF
`alpha`	scaling factors, calculated during reconstruction