OptimalSamplingSingleShellCNLOΒΆ

% update gradients from an initial gradient set, such that the updated gradients are evenly distributed.
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% INPUT
%   gradInitial       :  N x 3 gradient matrix, where each row is a point in sphere.
%   param.cartesian   :  true: use cartesian coordinate (with unit equality constraint);
%                        false: use spherical coordinate (no unit equality constraint)
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% OUTPUT
%   grad              :  updated N x 3 gradient matrix.
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% Reference:
%   1. "Single- and Multiple-Shell Uniform Sampling Schemes for Diffusion MRI Using Spherical Codes",
%       Jian Cheng, Dinggang Shen, Pew-Thian Yap, Peter J. Basser, IEEE Transactions on Medical Imaging, 2017.
%   2. "Novel single and multiple shell uniform sampling schemes for diffusion MRI using spherical codes",
%       Jian Cheng, Dinggang Shen, Pew-Thian Yap, Peter J. Basser, MICCAI 2015.
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% Copyright (c) 2014, Jian Cheng <jian.cheng.1983@gmail.com>
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