## Copyright (C) 2006 Sylvain Pelissier <sylvain.pelissier@gmail.com> ## ## This program is free software; you can redistribute it and/or modify ## it under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 2 of the License, or ## (at your option) any later version. ## ## This program is distributed in the hope that it will be useful, ## but WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with this program; If not, see <http://www.gnu.org/licenses/>. ## EXPINT compute the exponential integral, ## ## infinity ## / ## expint(x) = | exp(t)/t dt ## / ## x ## ## See also expint_Ei, expint_E1. function y = expint(x) if (nargin != 1) usage ("expint(x)"); endif y = expint_E1(x); endfunction;

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