scipy.sparse Matrix

A scipy.sparse Matrix is a sparse matrix data structure that is a scipy Data Structure.

• Context:
  • It can range from being a scipy.sparse.csr_matrix, to being a scipy.sparse.csc_matrix; to being a scipy.sparse.lil_matrix ...
• Example(s):
  • from scipy.sparse import csr_matrix, issparse, isspmatrix, isspmatrix_csc, isspmatrix_csr, isspmatrix_bsr, isspmatrix_lil, isspmatrix_dok, isspmatrix_coo, isspmatrix_dia ;
import numpy as np ;
sprsRowMatrix = sparse.csr_matrix(np.array([[1,2,0], [0,0,3], [1,0,4]])) ;
from scipy import int8 ;
sprsRowMatrixInt8 = csr_matrix(sprsRowMatrix, dtype=int8) ;
• Counter-Example(s):
  • a pandas.DataFrame.
• See: sklearn.

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References

2013

• http://docs.scipy.org/doc/scipy-0.14.0/reference/sparse.html#
  • SciPy 2-D sparse matrix package for numeric data.

    ...

    There are seven available sparse matrix types:

    • csc_matrix: Compressed Sparse Column format
    • csr_matrix: Compressed Sparse Row format
    • bsr_matrix: Block Sparse Row format
    • lil_matrix: List of Lists format
    • dok_matrix: Dictionary of Keys format
    • coo_matrix: COOrdinate format (aka IJV, triplet format)
    • dia_matrix: DIAgonal format

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