// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2008-2009 - INRIA - Michael Baudin
// Copyright (C) 2009-2010 - DIGITEO - Michael Baudin
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution.  The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt

//
// optimsimplex_dirmat --
//   Returns the n x n matrix of simplex directions i.e.
//   the matrix of differences of vertices coordinates
//   with respect to the vertex #1.
// Arguments
//   <no arg>
//
function m = optimsimplex_dirmat ( this )
    nv = this.nbve;
    v1 = this.x(1,1:this.n);
    m(1:this.n,1:nv-1) = (this.x(2:nv,1:this.n) - v1 .*. ones(nv-1,1)).';
endfunction