Changes in version 0.4-7 (2021-11-15)                  

    o   [BUGFIX] Vignette fix.

                 Changes in version 0.4-6 (2019-02-05)                  

    o   [BUGFIX] #15 `as.PiecewiseLinearFuzzyNumber` used to truncate the upper knots.

                 Changes in version 0.4-5 (2019-01-16)                  

    o   [BUGFIX] #14 `as.PiecewiseLinearFuzzyNumber` used to fail for some
	TriangularFuzzyNumbers

    o   updated manual & package metadata

                 Changes in version 0.4-2 (2018-02-14)                  

    o   updated manual & package metadata

                 Changes in version 0.4-1 (2015-02-26)                  

    o   added possibility and necessity functions that represent comparison
	operators <=,<,>,>= (with tests and description in vignette)

    o   added functions to determine minimum and maximum of two fuzzy numbers
	(description in vignette)

    o   added operator ^ for calculation of integer power of
	PiecewiseLinearFuzzyNumber

    o   added function arctan2 for calculation of atan2 with
	PiecewiseLinearFuzzyNumber arguments

                 Changes in version 0.3-5 (2014-10-01)                  

    o   added proper import directives in NAMESPACE

    o   piecewiseLinearApproximation: method="ApproximateNearestEuclidean"
	no longer accepted; use "NearestEuclidean" instead.

    o   package vignette now in the vignettes/ directory.

                 Changes in version 0.3-3 (2014-01-03)                  

    o   piecewiseLinearApproximation() now supports new method="SupportCorePreserving",
	    see  Coroianu L., Gagolewski M., Grzegorzewski P., Adabitabar Firozja M.,
	    Houlari T., Piecewise Linear Approximation of Fuzzy Numbers Preserving
	    the Support and Core, 2014 (submitted for publication).

    o   piecewiseLinearApproximation() now does not fail on exceptions thrown
	    by integrate(); fallback=Newton-Cotes formula.

    o   Removed `Suggests` dependency: testthat tests now available for developers
	    via the FuzzyNumbers github repository.

    o   Package manual has been corrected and extended.

    o   Package vignette is now only available
	    online at http://FuzzyNumbers.rexamine.com.

                 Changes in version 0.3-1 (2013-06-23)                  

    o   piecewiseLinearApproximation() - general case (any knot.n)
	for method="NearestEuclidean" now available.
	Thus, method="ApproximateNearestEuclidean" is now deprecated.

    o   New binary arithmetic operators, especially
	 for PiecewiseLinearFuzzyNumbers: +, -, *, /

    o   New method: fapply() - applies a function on a PLFN
	using the extension principle

    o   New methods: as.character(); also used by show().
	This function also allows to generate LaTeX code defining the FN
	(toLaTeX arg thanks to Jan Caha).

    o   as.FuzzyNumber(), as.TriangularFuzzyNumber(), as.PowerFuzzyNumber(), and
	as.PiecewiseLinearFuzzyNumber() are now S4 methods,
	and can be called on objects of type numeric, as well as on
	various FNs

    o   piecewiseLinearApproximation() and as.PiecewiseLinearFuzzyNumber()
	argument `knot.alpha` now defaults to equally distributed knots
	(via given `knot.n`). If `knot.n` is missing, then it is guessed
	from `knot.alpha`.

    o   PiecewiseLinearFuzzyNumber() now accepts missing `a1`, `a2`, `a3`, `a4`,
	and `knot.left`, `knot.right` of length `knot.n`+2. Moreover, if `knot.n`
	is not given, then it is guessed from length(knot.left).
	If `knot.alpha` is missing, then the knots will be equally distributed
	on the interval [0,1].

    o   alphacut() now always returns a named two-column matrix.
	evaluate() returns a named vector.

    o   New function: TriangularFuzzyNumber - returns a TrapezoidalFuzzyNumber.

    o   Function renamed: convert.side to convertSide, convert.alpha
	to convertAlpha, approx.invert to approxInvert

    o   Added a call to setGeneric("plot", function(x, y, ...) ...
	to avoid a warning on install

    o   The FuzzyNumbers Tutorial has been properly included
	as the package's vignette

    o   DiscontinuousFuzzyNumber class has been marked as **EXPERIMENTAL**
	in the manual

    o   Man pages extensively updated

    o   FuzzyNumbers devel repo moved to GitHub

                        Changes in version 0.2-1                        

    o   approx.invert(): a new function to find the numerical
	inverse of a given side/alpha-cut generating function
	(by default via Hermite monotonic spline interpolation)

    o   convert.side(), convert.alpha():
	new functions to convert sides and alpha cuts
	to side generating funs and alpha cut generators

    o   FuzzyNumber class validity check for lower, upper, left, right:

    o   checks whether each function is properly vectorized
	    and gives numeric results

    o   does not check for the number of formal arguments,
	    but just uses the first from the list

    o   Suggests `testthat`

    o   Each object has been documented

    o   First CRAN release

                        Changes in version 0.1-1                        

    o   Initial release