1.2.1

New Stuff

• Formatting support (f-strings, format(), ...)

Changes

• Run tests on more Python versions
• Update docs and PyPI classifiers

1.2.0

New Stuff

• Proper docs instead of a monolithic docs.md file.

Removed

• BREAKING: Scalar factories are no longer supported. They make typechecking extremely difficult and are too magical.
  • Since it's doubtful that anyone was using them (or this library, for that matter...) this is not marked with a major version change.

1.1.0

New Stuff

• MultiVector.exp computes math.e ** V using the Taylor series, which basically applies to anything for which scalar-thing and thing-thing addition and multiplication are defined.
• MultiVector.scalar classmethod generates a scalar MultiVector from a string, by passing it through the scalar factory.

Changes

• MultiVector.__rpow__ is now defined in terms of MultiVector.exp (a^b = e^(b ln a))
  • BREAKING: This means that math.e ** V == V.exp has different behavior from previous math.e ** V when V*V != -1. This is because previously I was mistakenly applying Euler's formula to objects that do not behave like the imaginary unit. The docs have been updated to reflect this.
  • Since this is a correction of behavior, I'm calling it a bugfix and not incrementing the major version.
  • Note that the behavior remains the same across versions when V*V == -1, which should be the case for all valid use cases of MultiVector.rotate

1.0.0

New Stuff

• MultiVector.grade returns the grade of a blade (a single-term multivector) or None if the multivector has more than one term.
• FEATURE: Scalar factories, by means of multivectors.set_scalar_factory(). See the end of the docs.
• MultiVectors can now compare equal to scalars if they themselves are scalar.
• MultiVectors can now be relationally compared with scalars if they themselves are scalar.
• MultiVectors can now be 1/ed, but only if they are blades.
• MultiVector.__invert__ implements the conjugate.

Changes

• BREAKING: Removed Blade class. It is replaced by single-term MultiVectors.
• BREAKING: Swapped behaviors of v % grade and v[idxs] - they are now v % idxs and v[grade(s)] because [] notation denotes subscript more often.
• MultiVector.terms now returns a tuple of single-term MultiVectors.
• MultiVector.__init__ now takes a more active role in casting values to the scalar factory.
• An empty MultiVector is no longer possible; if there are no terms, a scalar 0 is inserted.
• MultiVector.from_terms now always returns a MultiVector, which means that all operations now do too.
• repr(n * _) = '(' + repr(n) + ')' to distinguish it from n.
• Since Blade is no more, repr(v) now *-multiples bases instead of swizzling them.
• MultiVector.__pow__ no longer supports ternary pow() because modulo means index swizzling now.
• Normalization is now done by MultiVector.__pos__ instead of __invert__.
• math.fsum() is no longer used as it causes Decimals to lose precision by casting them to floats. If you need precision in addition, use Decimal.
• MultiVector.rotate will now raise a TypeError if plane is not a basis.

0.1.1

New Stuff

• Blade.__eq__, Blade.__ne__, MultiVector.__eq__, MultiVector.__ne__ are now defined for all objects.
• Blade.__lt__, Blade.__le__, Blade.__gt__, Blade.__ge__ are now defined for blades of the same bases.
• New documentation.
• run_tests.py runs doctest on the module and Markdown, with a non-zero exit status on failure.

Fixes

• A couple of fixes in doctests.

0.1.0

New Features

• multivectors.xy and from multivectors import xyz are now a thing (swizzling on the module level) but unlike class-level swizzling, invalid chars will cause an AttributeError (from multivectors import a would set a to 1.0 otherwise)
• Blade.terms returns (blade,) for compatibility with MultiVector.terms
• real @ blade is now supported
• A ** -n = 1 / (A ** n)
• real ^ blade is now supported
• To better mimic regular floats, scalar blades can now be passed to complex(), int(), and arr[]
• round(blade), math.trunc(blade), math.floor(blade), and math.ceil(blade) act on the scalar part, returning that times the bases
• simple @ multivector is now supported
• simple ^ multivector is now supported
• round(multivector), math.trunc(multivector), math.floor(multivector), and math.ceil(multivector) act on each component of the multivector, returning their sum

Changes

• names_to_idxs() takes a new parameter that controls whether to fail on invalid chars
• repr(Blade) uses repr() on its scalar again; %.2f is still used in str()
• multivector ** -n is now explicitly rejected

Fixes

• names_to_idxs() no longer fails on invalid chars between e and the digits of the number (enables e_1)
• idxs_to_idxs() now always returns a list
• str(Blade) used to return e0 for e1
• blade @ non-simple now correctly fails
• Fixed infinite recursion when Blade(scalar=x) / blade
• blade ^ non-simple now correctly fails
• blade ^ real no longer fails
• Correction: abs(blade) is (blade * blade) ** .5, not blade.scalar
• float(blade) can't return NotImplemented, so raise TypeError
• multivector % grade now returns the blades, not just their scalars
• MultiVector.angle_to() returns a real, not a MultiVector.
• Noted in docstring of MultiVector.angle_to() that multivectors of singular grade 1 only are accepted

0.0.0

Initial release

• Create the library