csr-matrix
A very minimal incremental compressed sparse row matrix library for JavaScript.
Install
npm i csr-matrix
Example
var dict = {}dict12 = 1dict00 = 25dict34 = 5 var CSRMatrix = var M = CSRMatrixconsole
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 multipliedresult
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