The optional third argument defaultValue. Initialized with zero, but it is possible to specify an alternative value using When setting a value at a location outside of the current matrix size using the It is important to note that the set method willĬonst p = math. There are two methods available on matrices that allow to get or set a single index ( 1, 2 ), 5 ) // Matrix,, ] Getting and setting a value in a matrix # The subset will be applied to the matrix itself c. index ( 2, ), ) // Array,, , ] // replace a subset. The subset will be applied to a clone of the matrix math. index ( 1, 2 )) // 5 // replace a subset. index (, 0 )) // Matrix,, ] // get a subset d. create some matrices const a = const b =, ] const c = math. Note that mathematical applications like MatlabĪnd Octave work differently, as they use one-based indexes. Matrix indexes in math.js are zero-based, like most programming languages Single value in a matrix, the value itself is returned. The function subset normally returns a subset, but when getting or setting a Subset will return the value itself instead of a matrix containing just this When getting a single value from a matrix, An Index can beĬreated using the function index. Or a set of values for each dimension of a matrix. In the matrix, and if not, a subset of the matrix will be returned.Ī subset can be defined using an Index. When parameter replacement is provided, the function will replace a subset The static function subset(matrix, index ) can be used. Matrices have a subset function, which is applied to the matrix itself: Subsets of a matrix can be retrieved or replaced using the function subset. index ( 1, 0 )) // 2 and not ] Getting or replacing subsets # squeeze (]) // 3 // when getting/setting a single value in a matrix using subset, // it automatically squeeze/unsqueeze the value const b = math. Normally rendered as the column, and the second dimension is rendered as When creating and printing a two dimensional matrix, the first dimension is Note that the dimensions themselves do not have a meaning attached. size () // Array, // get the size of a multi-dimensional matrix const c =, ],, ]] math. size ( b ) // Matrix, // matrices have a function size (always returns an Array) b. size ( ' hello world ' ) // Matrix, // get the size of a two-dimensional matrix const a = ] // Array const b = math. unit ( ' 5.3 mm ' )) // Matrix, // get the size of a one-dimensional matrix (a vector) and a string math. Note that in case of numbers as arguments, the output isĭetermined by the option matrix as discussed in section When the input is a Matrix, the output willīe a Matrix. Or matrix containing the dimensions for the matrix. The functions ones, zeros, and identity also accept a single array identity ( 3 ) // Matrix, size, ,, ] math. ones ( 2, 2 ), 5 ) // Matrix, size, , ] // identity creates an identity matrix math. zeros ( 2, 2, 2 ) // Matrix, size, //, ],, ]] // ones creates a matrix filled with ones math. zeros ( 3, 2 ) // Matrix, size, ,, ] math. zeros creates a matrix filled with zeros math. ![]() Which can be a string 'Matrix' (default) or 'Array'. Input, the output is determined by the configuration option matrix, In case of mixed input, a Matrix is returned.įor functions where the type of output cannot be determined from the In most cases, the type of matrix output from functions is determined by theįunction input: An Array as input will return an Array, a Matrix as input Matrix manipulation such as subset, size, resize, clone, and more. A Matrix is an object wrappedĪround a regular JavaScript Array, providing utility functions for easy Matrix, a matrix implementation by math.js.math.js supports bothĭense and sparse matrices. ![]() Interchangeably in all relevant math.js functions. ![]() Both regular JavaScriptĪrrays as well as the matrix type implemented by math.js can be used Matrices can beĬreated, manipulated, and used in calculations. Math.js supports multi dimensional matrices and arrays.
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