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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/lognum|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == lognum === Introduction A logarithmic number system (LNS) is an arithmetic system for representing real numbers. In LNS, a number X, is represented by the logarithm L of its absolute value: X -> { s, L = \log_b(|X|) } where {{s}} denotes the sign of {{X}} ({{s = 1}} if {{X > 0}} and {{s = -1}} if {{X < 0}}). === Requires ; [[syntax-case]] ; [[matchable]] ; [[datatype]] === Library procedures <procedure>{{lognum?:: X -> BOOL}}</procedure> <procedure>{{lognum-sign:: X -> INTEGER}}</procedure> <procedure>{{lognum-value:: X -> NUMBER}}</procedure> <procedure>{{number->lognum:: NUMBER -> LOGNUM}}</procedure> <procedure>{{lognum->number:: LOGNUM -> NUMBER}}</procedure> <procedure>{{lognum+:: A * B -> X}}</procedure> <procedure>{{lognum-:: A * B -> X}}</procedure> <procedure>{{lognum*:: A * B -> X}}</procedure> <procedure>{{lognum/:: A * B -> X}}</procedure> <procedure>{{lognum-neg:: A -> B}}</procedure> <procedure>{{lognum-abs:: A -> B}}</procedure> <procedure>{{lognum-signum:: A -> B}}</procedure> <procedure>{{lognum-recip:: A -> B}}</procedure> === Authors Ivan Raikov === Version ; 1.0 : Initial version === License Copyright 2009 Ivan Raikov and the Okinawa Institute of Science and Technology. 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 3 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. A full copy of the GPL license can be found at <http://www.gnu.org/licenses/>. Description of your changes:

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