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| xTras changelog | ||
| =============== | ||
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| v1.2.0, 2013-08-12 | ||
| ------------------ | ||
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| Big changes: | ||
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| * Added built-in documentation. | ||
| * Added the xTrasHelp command, which opens the xTras documentation. | ||
| * Added fancy usage messages. | ||
| * All public symbols are back in the same context ("xAct\`xTras\`"). | ||
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| Other changes: | ||
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| * Added DefNiceConstantSymbol. | ||
| * Added TableauDimension. | ||
| * Added the AllContractions:nocontr message, which is generated when AllContractions returns nothing (for various reasons). | ||
| * AllContractions also takes Lists as second arguments. | ||
| * AllContractions can also handle expression with odd number of indices. | ||
| * AllContractions gives less duplicate results. | ||
| * AllContractions returns an empty list instead of throwing an exception for cases where there are no contractions. | ||
| * Changed Implode/ExplodeIndices to To/FromIndexFree. | ||
| * Changed UncontractedPairs to UncontracedIndices. | ||
| * Fixed bug in SolveTensors. | ||
| * It is now possible to change dimensions between ConstructDDIs calls. | ||
| * Removed DoTensorCollect. | ||
| * Removed ExpandPerturbationDer. | ||
| * Removed FS. | ||
| * Removed MakeEquationRule. | ||
| * Removed MetricPermutations. | ||
| * Removed OrderCoefficient. | ||
| * Removed PerturbationOfMetric. | ||
| * Removed PerturbationParameter. | ||
| * Removed PerturbationParameterOfMetric. | ||
| * Removed TensorCollect. | ||
| * Removed TensorCollector. | ||
| * Removed UnorderedPairsPermutations. | ||
| * Reset $CovDFormat and CurvatureRelations at load time. | ||
| * RiemannYoungProject and RiemannYoungRule take the option ManifestSymmetry. | ||
| * RiemannYoungRule and RiemannYoungProject no longer take a levelspec argument, but always project the Riemann and its first derivative onto their Young tableaux. | ||
| * TableauSymmetric is MMA 6 compatible. | ||
| * TermsOf now removes constants. | ||
| * The default value of Description is None. | ||
| * TimeString[60] returns "1 minute" instead of "60 seconds". | ||
| * YoungProject is faster. | ||
| * YoungTableauQ is a bit more precise. | ||
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| v1.1.3, 2013-05-29 | ||
| ------------------ | ||
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| Changes: | ||
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| * Added MakeTraceless. | ||
| * Added ConstructDDIs. | ||
| * Added YoungSymmetric. | ||
| * Added ToLevelSpec. | ||
| * Added ExplodeIndices and ImplodeIndices. | ||
| * Added MakeContractionAnsatz. | ||
| * Removed ContractedPairs. | ||
| * Don't define the auxiliary tensor in AllContractions if it already exists. | ||
| * AllContractions returns fewer duplicate contractions. | ||
| * SolveTensors solves by default for monomials. | ||
| * CollectTensors works better with Scalar objects. | ||
| * Made CollectTensors a bit more verbose. | ||
| * Fixed a bug in CollectTensors (where canonicalization of tensors would prevent collecting). | ||
| * The default perturbation parameter of the metric is no longer called "\[Epsilon]metric", but "PerturbationParametermetric". | ||
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| v1.1.2, 2013-03-06 | ||
| ------------------ | ||
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| What's new: | ||
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| * Added option ManifestSymmetry to YoungSymmetrize that controls the convention of symmetrizing (i.e. first symmetric, then antisymmetric, or the other way around). | ||
| * Fixed a small bug in CollectTensors. | ||
| * Allow Young tableaux to be subsets of free indicesof expressions / tensors. | ||
| * Changed SolveTensors to allow for patterns in list of tensors to solve for. | ||
| * Fixed trying to set Bianchi identities for flat metrics. | ||
| * Fixed build file. | ||
| * Fixed: SolveConstants doesn't try to solve for numeric symbols (such as Pi). | ||
| * Replaced some Modules with Withs. | ||
| * InvarWrapper nicely aborts if the Invar database is not found. | ||
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| v1.1.1, 2013-01-26 | ||
| ------------------ | ||
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| What's new: | ||
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| * xTras now requires MMA 6. | ||
| * Broken xTras into multiple packages. | ||
| * Added Kretschmann scalar to SymmetricSpaceRules. | ||
| * Added ToRicci. | ||
| * Added RiemannYoungProject. | ||
| * Added option Parallelization to MapTimed. If True, MapTimed uses ParallelMap. | ||
| * Added MapTensors / MapTimedTensors. | ||
| * Added CollectConstants. | ||
| * Renamed TensorCollector to TensorWrapper. | ||
| * Renamed TensorCollect to CollectTensors. | ||
| * Renamed PreferBox/DivOf to SortCovDsToBox/Div. | ||
| * Renamed RiemannDivRule / RicciDivRule to CurvatureRelationsBianchi. | ||
| * Renamed the function KillingVectorOf to MetricOfKillingVector; the option KillingVectorOf is still named the same. | ||
| * Removed PreferBox/DivOfRule. | ||
| * Removed option MonitorSteps from MapTimed. | ||
| * Changed DerivativeOrder slightly (added thread over Plus and support for Kretschmann scalar). | ||
| * Changed IndexConfigurations to return a sorted list. | ||
| * Changed EulerDensity to return object with Scalar heads. | ||
| * Changed Invar functions to block printing of reading of Invar database. | ||
| * Changed default printing of metric perturbations to PrintAs[Perturbation] <> PrintAs[metric]. | ||
| * Fixed a bug in MapTensors. It now passes options to its internal function. | ||
| * Fixed a bug in SolveTensors. (Forgot to add a levelspec to Position. Don't know why it previously worked on MMA < 9.) | ||
| * SolveTensors only sorts the tensors it solves for when the user doesn't specify them (with SolveTensors[expr==0] ). | ||
| * SolveTensors sorts the tensors to solve for by first removing TensorWrappers. | ||
| * RemoveConstants now also removes constants from expressions without tensors (resulting in 1). | ||
| * CollectTensors no longer threads over lists (as it is no longer necessary). | ||
| * AllContractions sorts answer and deletes duplicates and zero. | ||
| * Introduced UnitConstant to TensorWrapper. | ||
| * VarL performs variations w.r.t. metric determinant separately. | ||
| * MapTimed no longer has the DoTensorCollect option. | ||
| * FullSimplification doesn't call TensorCollect in the end, but ToCanonical. | ||
| * DefMetric no longer has the DefVariation option, but instead a DefMetricPerturbation option. | ||
| * DefMetricPerturbation automatically defines a metric variation (DefMetricVariation is now private). | ||
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| v1.0.6, 2012-12-23 | ||
| ------------------ | ||
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| What's new: | ||
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| * Added SolveTensors, which can solve (a system of) linear tensor equations, and deprecates MakeEquationRule. | ||
| * Added IndexConfigurations. | ||
| * Added PreferDifOf and PreferBoxOf functions. | ||
| * Added MapTimedIfPlus. | ||
| * Added options (Un)contractedPairs to AllContractions. | ||
| * Added options RemoveTensorCollector and Verbose to TensorCollect. | ||
| * TensorCollect prints a message if things might not have been fully collected. | ||
| * TensorCollector threads over Equal. | ||
| * TensorCollector prints like Scalar: with colored parentheses around the wrapped expression. | ||
| * New and faster algorithm for AllContractions, that contracts indices stepwise. | ||
| * Delete duplicate equations from ToConstantSymbolEquations. | ||
| * Another (sigh) and faster rewrite of TensorCollect. | ||
| * Speed improvements in SolveConstants. | ||
| * MapTimed prints info a bit nicer. | ||
| * Don't restrict ToConstantSymbolEquations to work only on things that don't contain lists (this prevented it to work on basis expressions). | ||
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| v1.0.5, 2012-11-09 | ||
| ------------------ | ||
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| What's new: | ||
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| * Made TensorCollect listable. | ||
| * ToConstantSymbolEquations handles more cases (lists, a==b==c). | ||
| * SolveConstants now takes a ! argument, which specify which variables we shouldn't solve for. | ||
| * Changed AllContractions, both the algorithm and the interface. | ||
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| v1.0.4, 2012-10-25 | ||
| ------------------ | ||
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| What's new: | ||
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| * Added two xCoba extensions, ComputeBasisValues and ImplodedTensorValues. | ||
| * Added Perturbation(Parameter)OfMetric. | ||
| * Added SolveConstants, which is much more similar to Solve than TensorCollectSolve was. | ||
| * Removed TensorCollectSolve. | ||
| * Renamed MyRiemannSimplify to RiemannSimplification. | ||
| * Changed MakeEquationRule such that it only works for equations (LHS == RHS). | ||
| * $RicciSign is now taken into account in various functions. | ||
| * Fixed a minor bug ( #&/ instead of #&/@ ) in PreferDivOfRule. | ||
| * Remove zeros from AllContractions. | ||
| * Don't show Def messages for temporary constants. | ||
| * Updated some usage messages. | ||
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| v1.0.3, 2012-10-10 | ||
| ------------------ | ||
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| What's new: | ||
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| * Added SortedCovDsQ | ||
| * Added AllContractions. | ||
| * Added MetricPermutations. | ||
| * MapTimed now works for generic levelspecs. | ||
| * Gave RiemannYoungRule a levelspec. | ||
| * Different implementation of Killing vectors. No longer need to issue the 'Killing' command. | ||
| * Killing vector are now defined w.r.t. to metrics, not CovDs. | ||
| * Allow for label indices in Killing vectors. | ||
| * Added version check for xTensor. | ||
| * xTras initialization messages are more like xAct. | ||
| * Automatically define metric variations by default when defining a metric. | ||
| * Removed the FD symbols and functionality. | ||
| * Renamed FS to FullSimplification. | ||
| * MyRiemannSimplify now only acts on Riccis and Riemanns, fixing a bug that appeared when it acted on other curvature tensors. | ||
| * MyRiemannSimplify checks more carefully for wrong values of $InvSimplifyLevel | ||
| * Fixed bug in MakeEquationRule that caused the LHS to still be partly present in the RHS. | ||
| * ExpandPerturbation now knows how to deal with extra curvature tensors. | ||
| * Removed ExpandPerturbationDer from VarDt function, hopefully fixing a bug that was probably caused by using SeparateMetric[] twice. | ||
| * Fixed a bug in YoungTableauQ that prevented symmetric Young tableaux from evaluating to True. | ||
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| v1.0.2, 2012-08-19 | ||
| ------------------ | ||
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| What's new: | ||
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| * Implemented Killing vectors. Killing vectors can be define w.r.t. a covariant derivative while define the vector itself, e.g. DefTensor[V[-a],M,KillingVectorOf->CD]. | ||
| * Fixed a bug in ConstantExprQ. | ||
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| v1.0.1, 2012-05-06 | ||
| ------------------ | ||
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| What's new: | ||
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| * Added xTension hook. The package automatically defines Schouten tensors etc. when calling DefMetric. | ||
| * Fixed a bug in InvarWrapper (so MyRiemannSimplify should work in more cases). | ||
| * Renamed TimedMap to MapTimed. | ||
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| v1.0.0, 2012-03-25 | ||
| ------------------ | ||
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| First version. | ||
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