prtools.index#

class index(row, col, shape)[source]#

Sparse coordinate list (COO) index

Parameters:

row (array_like) – List of row indices which contain nonzero data
col (array_like) – List of column indices which contain nonzero data
shape ((2,) array_like) – Dimensions of dense matrix

nnz#

Number of nonzero entries in dense matrix

Type:: int

Return type:: index

See also

sparse() Create a sparse array from a dense matrix
dense() Create a dense matrix from a sparse array