HISTORY.md

math.js history

https://github.com/josdejong/mathjs

2014-02-15, version 0.18.1

• Added unit feet.
• Implemented function compile (shortcut for parsing and then compiling).
• Improved performance of function pow for matrices. Thanks hamadu.
• Fixed broken auto completion in the command line interface.
• Fixed an error in function combinations for large numbers, and improved performance of both functions combinations and permutations.

2014-01-18, version 0.18.0

• Changed matrix index notation of expression parser from round brackets to square brackets, for example A[1, 1:3] instead of A(1, 1:3).
• Removed need to use the function keyword for function assignments in the expression parser, you can define a function now like f(x) = x^2.
• Implemented a compilation step in the expression parser: expressions are compiled into JavaScript, giving much better performance (easily 10x as fast).
• Renamed unit conversion function and operator in to to. Operator in is still available in the expression parser as an alias for to. Added unit in, an abbreviation for inch. Thanks Elijah Insua (tmpvar).
• Added plurals and aliases for units.
• Implemented an argument includeEnd for function range (false by default).
• Ranges in the expression parser now support big numbers.
• Implemented functions permutations and combinations. Thanks Daniel Levin (daniel-levin).
• Added lower case abbreviation l for unit litre.

2013-12-19, version 0.17.1

• Fixed a bug with negative temperatures.
• Fixed a bug with prefixes of units squared meter m2 and cubic meter m3.

2013-12-12, version 0.17.0

• Renamed and flattened configuration settings:
  • number.defaultType is now number.
  • number.precision is now decimals.
  • matrix.defaultType is now matrix.
• Function multiply now consistently outputs a complex number on complex input.
• Fixed mod and in not working as function (only as operator).
• Fixed support for old browsers (IE8 and older), compatible when using es5-shim.
• Fixed support for Java's ScriptEngine.

2013-11-28, version 0.16.0

• Implemented BigNumber support for arbitrary precision calculations. Added settings number.defaultType and number.precision to configure big numbers.
• Documentation is extended.
• Removed utility functions isScalar, toScalar, isVector, toVector from Matrix and Range. Use math.squeeze and math.size instead.
• Implemented functions get and set on Matrix, for easier and faster retrieval/replacement of elements in a matrix.
• Implemented function resize, handling matrices, scalars, and strings.
• Functions ones and zeros now return an empty matrix instead of a number 1 or 0 when no arguments are provided.
• Implemented functions min and max for Range and Index.
• Resizing matrices now leaves new elements undefined by default instead of filling them with zeros. Function resize now has an extra optional parameter defaultValue.
• Range operator : in expression parser has been given a higher precedence.
• Functions don't allow arguments of unknown type anymore.
• Options be set when constructing a math.js instance or using the new function config(options. Options are no longer accessible via math.options.
• Renamed scientific notation to exponential in function format.
• Function format outputs exponential notation with positive exponents now always with + sign, so outputs 2.1e+3 instead of 2.1e3.
• Fixed function squeeze not being able squeeze into a scalar.
• Some fixes and performance improvements in the resize and subset functions.
• Function size now adheres to the option matrix.defaultType for scalar input.
• Minor bug fixes.

2013-10-26, version 0.15.0

• Math.js must be instantiated now, static calls are no longer supported. Usage:
  • node.js: var math = require('mathjs')();
  • browser: var math = mathjs();
• Implemented support for multiplying vectors with matrices.
• Improved number formatting:
  • Function format now support various options: precision, different notations (fixed, scientific, auto), and more.
  • Numbers are no longer rounded to 5 digits by default when formatted.
  • Implemented a function format for Matrix, Complex, Unit, Range, and Selector to format using options.
  • Function format does only stringify values now, and has a new parameter precision to round to a specific number of digits.
  • Removed option math.options.precision, use math.format(value [, precision]) instead.
  • Fixed formatting numbers as scientific notation in some cases returning a zero digit left from the decimal point. (like "0.33333e8" rather than "3.3333e7"). Thanks husayt.
• Implemented a function print to interpolate values in a template string, this functionality was moved from the function format.
• Implemented statistics function mean. Thanks Guillermo Indalecio Fernandez (guillermobox).
• Extended and changed max and min for multi dimensional matrices: they now return the maximum and minimum of the flattened array. An optional second argument dim allows to calculate the max or min for specified dimension.
• Renamed option math.options.matrix.default to math.options.matrix.defaultType.
• Removed support for comparing complex numbers in functions smaller, smallereq, larger, largereq. Complex numbers cannot be ordered.

2013-10-08, version 0.14.0

• Introduced an option math.options.matrix.default which can have values matrix (default) or array. This option is used by the functions eye, ones, range, and zeros, to determine the type of matrix output.
• Getting a subset of a matrix will automatically squeeze the resulting subset, setting a subset of a matrix will automatically unsqueeze the given subset.
• Removed concatenation of nested arrays in the expression parser. You can now input nested arrays like in JavaScript. Matrices can be concatenated using the function concat.
• The matrix syntax [...] in the expression parser now creates 1 dimensional matrices by default. math.eval('[1,2,3,4]') returns a matrix with size [4], math.eval('[1,2;3,4]') returns a matrix with size [2,2].
• Documentation is restructured and extended.
• Fixed non working operator mod (modulus operator).

2013-09-03, version 0.13.0

• Implemented support for booleans in all relevant functions.
• Implemented functions map and forEach. Thanks Sebastien Piquemal (sebpic).
• All construction functions can be used to convert the type of variables, also element-wise for all elements in an Array or Matrix.
• Changed matrix indexes of the expression parser to one-based with the upper-bound included, similar to most math applications. Note that on a JavaScript level, math.js uses zero-based indexes with excluded upper-bound.
• Removed support for scalars in the function subset, it now only supports Array, Matrix, and String.
• Removed the functions get and set from a selector, they are a duplicate of the function subset.
• Replaced functions get and set of Matrix with a single function subset.
• Some moving around with code and namespaces:
  • Renamed namespace math.expr to math.expression (contains Scope, Parser, node objects).
  • Renamed namespace math.docs to math.expression.docs.
  • Moved math.expr.Selector to math.chaining.Selector.
• Fixed some edge cases in functions lcm and xgcd.

2013-08-22, version 0.12.1

• Fixed outdated version of README.md.
• Fixed a broken unit test.

2013-08-22, version 0.12.0

• Implemented functions random([min, max]), randomInt([min, max]), pickRandom(array). Thanks Sebastien Piquemal (sebpic).
• Implemented function distribution(name), generating a distribution object with functions random, randomInt, pickRandom for different distributions. Currently supporting uniform and normal.
• Changed the behavior of range to exclude the upper bound, so range(1, 4) now returns [1, 2, 3] instead of [1, 2, 3, 4].
• Changed the syntax of range, which is now range(start, end [, step]) instead of range(start, [step, ] end).
• Changed the behavior of ones and zeros to geometric dimensions, for example ones(3) returns a vector with length 3, filled with ones, and ones(3,3) returns a 2D array with size [3, 3].
• Changed the return type of ones and zeros: they now return an Array when arguments are Numbers or an Array, and returns a Matrix when the argument is a Matrix.
• Change matrix index notation in parser from round brackets to square brackets, for example A[0, 0:3].
• Removed the feature introduced in v0.10.0 to automatically convert a complex value with an imaginary part equal to zero to a number.
• Fixed zeros being formatted as null. Thanks TimKraft.

2013-07-23, version 0.11.1

• Fixed missing development dependency

2013-07-23, version 0.11.0

• Changed math.js from one-based to zero-based indexes.
  • Getting and setting matrix subset is now zero-based.
  • The dimension argument in function concat is now zero-based.
• Improvements in the string output of function help.
• Added constants true and false.
• Added constructor function boolean.
• Fixed function select not accepting 0 as input. Thanks Elijah Manor (elijahmanor).
• Parser now supports multiple unary minus operators after each other.
• Fixed not accepting empty matrices like [[], []].
• Some fixes in the end user documentation.

2013-07-08, version 0.10.0

• For complex calculations, all functions now automatically replace results having an imaginary part of zero with a Number. (2i * 2i now returns a Number -4 instead of a Complex -4 + 0i).
• Implemented support for injecting custom node handlers in the parser. Can be used for example to implement a node handler for plotting a graph.
• Implemented end user documentation and a new help function.
• Functions size and squeeze now return a Matrix instead of an Array as output on Matrix input.
• Added a constant tau (2 * pi). Thanks Zak Zibrat (palimpsests).
• Renamed function unaryminus to unary.
• Fixed a bug in determining node dependencies in function assignments.

2013-06-14, version 0.9.1

• Implemented element-wise functions and operators: emultiply (x .* y), edivide (x ./ y), epow (x .^ y).
• Added constants Infinity and NaN.
• Removed support for Workspace to keep the library focused on its core task.
• Fixed a bug in the Complex constructor, not accepting NaN values.
• Fixed division by zero in case of pure complex values.
• Fixed a bug in function multiply multiplying a pure complex value with Infinity.

2013-05-29, version 0.9.0

• Implemented function math.parse(expr [,scope]). Optional parameter scope can be a plain JavaScript Object containing variables.
• Extended function math.expr(expr [, scope]) with an additional parameter scope, similar to parse. Example: math.eval('x^a', {x:3, a:2});.
• Implemented function subset, to get or set a subset from a matrix, string, or other data types.
• Implemented construction functions number and string (mainly useful inside the parser).
• Improved function det. Thanks Bryan Cuccioli (bcuccioli).
• Moved the parse code from prototype math.expr.Parser to function math.parse, simplified Parser a little bit.
• Strongly simplified the code of Scope and Workspace.
• Fixed function mod for negative numerators, and added error messages in case of wrong input.

2013-05-18, version 0.8.2

• Extended the import function and some other minor improvements.
• Fixed a bug in merging one dimensional vectors into a matrix.
• Fixed a bug in function subtract, when subtracting a complex number from a real number.

2013-05-10, version 0.8.1

• Fixed an npm warning when installing mathjs globally.

2013-05-10, version 0.8.0

• Implemented a command line interface. When math.js is installed globally via npm, the application is available on your system as 'mathjs'.
• Implemented end keyword for index operator, and added support for implicit start and end (expressions like a(2,:) and b(2:end,3:end-1) are supported now).
• Function math.eval is more flexible now: it supports variables and multi-line expressions.
• Removed the read-only option from Parser and Scope.
• Fixed non-working unequal operator != in the parser.
• Fixed a bug in resizing matrices when replacing a subset.
• Fixed a bug in updating a subset of a non-existing variable.
• Minor bug fixes.

2013-05-04, version 0.7.2

• Fixed method unequal, which was checking for equality instead of inequality. Thanks FJS2.

2013-04-27, version 0.7.1

• Improvements in the parser:
  • Added support for chained arguments.
  • Added support for chained variable assignments.
  • Added a function remove(name) to remove a variable from the parsers scope.
  • Renamed nodes for more consistency and to resolve naming conflicts.
  • Improved stringification of a node tree.
  • Some simplifications in the code.
  • Minor bug fixes.
• Fixed a bug in the parser, returning NaN instead of throwing an error for a number with multiple decimal separators like 2.3.4.
• Fixed a bug in Workspace.insertAfter.
• Fixed: math.js now works on IE 6-8 too.

2013-04-20, version 0.7.0

• Implemented method math.eval, which uses a readonly parser to evaluate expressions.
• Implemented method xgcd (extended eucledian algorithm). Thanks Bart Kiers (bkiers).
• Improved math.format, which now rounds values to a maximum number of digits instead of decimals (default is 5 digits, for example math.format(math.pi) returns 3.1416).
• Added examples.
• Changed methods square and cube to evaluate matrices element wise (consistent with all other methods).
• Changed second parameter of method import to an object with options.
• Fixed method math.typeof on IE.
• Minor bug fixes and improvements.

2013-04-13, version 0.6.0

• Implemented chained operations via method math.select(). For example math.select(3).add(4).subtract(2).done() will return 5.
• Implemented methods gcd and lcm.
• Implemented method Unit.in(unit), which creates a clone of the unit with a fixed representation. For example math.unit('5.08 cm').in('inch') will return a unit which string representation always is in inch, thus 2 inch. Unit.in(unit) is the same as method math.in(x, unit).
• Implemented Unit.toNumber(unit), which returns the value of the unit when represented with given unit. For example math.unit('5.08 cm').toNumber('inch') returns the number 2, as the representation of the unit in inches has 2 as value.
• Improved: method math.in(x, unit) now supports a string as second parameter, for example math.in(math.unit('5.08 cm'), 'inch').
• Split the end user documentation of the parser functions from the source files.
• Removed function help and the built-in documentation from the core library.
• Fixed constant i being defined as -1i instead of 1i.
• Minor bug fixes.

2013-04-06, version 0.5.0

• Implemented data types Matrix and Range.
• Implemented matrix methods clone, concat, det, diag, eye, inv, ones, size, squeeze, transpose, zeros.
• Implemented range operator :, and transpose operator ' in parser.
• Changed: created construction methods for easy object creation for all data types and for the parser. For example, a complex value is now created with math.complex(2, 3) instead of new math.Complex(2, 3), and a parser is now created with math.parser() instead of new math.parser.Parser().
• Changed: moved all data types under the namespace math.type, and moved the Parser, Workspace, etc. under the namespace math.expr.
• Changed: changed operator precedence of the power operator:
  • it is now right associative instead of left associative like most scripting languages. So 2^3^4 is now calculated as 2^(3^4).
  • it has now higher precedence than unary minus most languages, thus -3^2 is now calculated as -(3^2).
• Changed: renamed the parsers method 'put' into 'set'.
• Fixed: method 'in' did not check for units to have the same base.

2013-03-16, version 0.4.0

• Implemented Array support for all methods.
• Implemented Array support in the Parser.
• Implemented method format.
• Implemented parser for units, math.Unit.parse(str).
• Improved parser for complex values math.Complex.parse(str);
• Improved method help: it now evaluates the examples.
• Fixed: a scoping issue with the Parser when defining functions.
• Fixed: method 'typeof' was not working well with minified and mangled code.
• Fixed: errors in determining the best prefix for a unit.

2013-03-09, version 0.3.0

• Implemented Workspace
• Implemented methods cot, csc, sec.
• Implemented Array support for methods with one parameter.

2013-02-25, version 0.2.0

• Parser, Scope, and Node tree implemented.
• Implemented method import which makes it easy to extend math.js.
• Implemented methods arg, conj, cube, equal, factorial, im, largereq, log(x, base), log10, mod, re, sign, smallereq, square, unequal.

2013-02-18, version 0.1.0

• Reached full compatibility with Javascripts built-in Math library.
• More functions implemented.
• Some bugfixes.

2013-02-16, version 0.0.2

• All constants of Math implemented, plus the imaginary unit i.
• Data types Complex and Unit implemented.
• First set of functions implemented.

2013-02-15, version 0.0.1

• First publish of the mathjs package. (package is still empty)