## 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`).

### Requirements

### Library procedures

`lognum?:`procedure`lognum-sign:`procedure`lognum-value:`procedure`number->lognum:`procedure`lognum->number:`procedure`lognum+:`procedure`lognum-:`procedure`lognum*:`procedure`lognum/:`procedure`lognum-neg:`procedure`lognum-abs:`procedure`lognum-signum:`procedure`lognum-recip:`procedure

### Authors

Ivan Raikov

### Version

- 1.1
- Ported to Chicken 4
- 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/>.