Neural Processing Mechanisms

    csr-matrix

    2.0.0 • Public • Published

    csr-matrix

    A very minimal incremental compressed sparse row matrix library for JavaScript.

    Install

    npm i csr-matrix
    

    Example

    var dict = {}
    dict[[1,2]] = 1
    dict[[0,0]] = 2.5
    dict[[3,4]] = 5
     
    var CSRMatrix = require("csr-matrix")
     
    var M = CSRMatrix.fromDictionary(dict, 4, 5)
    console.log(M.apply([1,2,3,4,5], []))

    API

    CSRMatrices are optimized for exactly one thing: fast matrix-vector multiplies. The way you do this is by calling the following method:

    Constructors

    There are several ways to create csr-matrices. The most direct way to do this is to just call the constructor yourself:

    CSRMatrix.fromList(items[, nrows, ncols])

    Turns an array of entries of the form [row, column, value] into a sparse matrix. Note that if there are some zero rows or columns at the end of the matrix, you need to specify the number of rows/columns in the optional nrows/ncols arguments.

    CSRMatrix.fromDictionary(dict[, nrows, ncols])

    Converts a JavaScript object with entries for the form "row,column" into a sparse matrix.

    CSRMatrix.fromDense(mat)

    Turns an array-of-arrays into a csr matrix

    CSRMatrix.fromNDArray(ndarr)

    Turns a 2D dimensional ndarray into a csr matrix

    Method

    matrix.apply(vector[, result])

    This computes the normal matrix-vector product, but is often much faster than a dense multiply since the matrix is stored in a compressed sparse format.

    • vector is the vector to be multiplied
    • result is an optional array which gets the result. If not specified, a new vector gets allocated

    Returns the resulting product

    matrix.transpose()

    Returns the transpose of the matrix

    matrix.rowCount

    Returns the number of rows

    matrix.columnCount

    Returns the number of columns

    matrix.toList()

    Converts matrix into a list format

    matrix.toDictionary()

    Converts matrix into hash table

    matrix.toDense()

    Converts matrix into array of arrays

    matrix.toNDArray(out)

    Converts matrix into ndarray

    • out is the output ndarray

    Credits

    (c) 2013-2015 Mikola Lysenko. BSD

    Install

    npm i csr-matrix

    DownloadsWeekly Downloads

    7

    Version

    2.0.0

    License

    MIT

    Last publish

    Collaborators

    • mikolalysenko