view docs/readme-4.0.txt @ 434:052c5f335a92

Fix bug in like terms collection in expression simplification Like term collection would lose the actual "variable" part of the term if the second term collected happened to have no coefficient. This would cause the expression to take the value of the calculated coefficient which is obviously wrong. Thanks to hider <stego@satx.rr.com> for reporting the bug and providing a proper test case. Observation: this bug has been present since the first pre-release of lwtools 3.0 when the algebraic expression system was introduced. Apparently people tend not to create expressions that trigger the like terms handler. The specific conditions require the symbol to be undefined and the second operand to the addition has to have no coefficient so it's likely a fairly rare scenario. Still, it is somewhat surprising that nobody tripped on it before now.
author William Astle <lost@l-w.ca>
date Mon, 23 Jan 2017 22:58:36 -0700
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With LWTOOLS 4.0, a substantial reorganization of the project has occurred.
This document serves to explain the reasoning behind the various changes.

The most obvious change is that the gnu auto tools have been eliminated.
While they proved useful for initial distribution of the software,
particularly for construction of the win32 binaries, they have since proved
to add an unacceptable level of complexity to every aspect of development
from merely tinkering with source files to doing complete releases. Thus,
the auto tools have been ditched in favour of specific hand tuned help where
required.

The other substantial change is that the source code repository has been
recreated from scratch. The old repository was full of cruft from various
revision control systems that were used over the years (CVS, Subversion, and
Mercurial). It was felt that starting a new Mercurial repository with a
completely clean slate would simplify matters substantially. Thus, the old
repository now serves as an archive.