mossadal/math-parser

Improved error message for UnknownTokenException

Separate handling of ln/log.
Parsers now inherit from AbstractMathParser (thanks to HorseLuke).
Removed 'i' from StdMathLexer (complex numbers only available through ComplexLexer)

• LaTeXPrinter prints exp(x/3) as e^{x/3}, i.e. with solidus instead
  of \frac, following up on 1.3.12 update for handling of a^(x/3)

Improved differentiation of e^x

Optionally allow denormalized rationals in RationalNode

Slight bug fixes:

• cot(0), coth(0), cotd(0) now returns NAN rather than throwing a DivisionByZero error
• Handling of ^ in Evaluator tweaked so that e^x and exp(x) always returns the same value. (Apparantly, pow(M_E,x) and exp(x) in PHP are not quite identical.)
• Bug in LaTeXPrinter was causing a missing \cdot in some expressions, e.g. "2*3^2" was written as "23^2" rather than "2\cdot 3^2". This is now fixed.

Set Evaluator::variables to [] instead of null as a default. See issu…

Fixed Evaluator bug in sgn()