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This is documentation for an old release of SciPy (version 1.5.3). Read this page in the documentation of the latest stable release (version 1.15.1).

scipy.sparse.dok_matrix.count_nonzero

dok_matrix.count_nonzero(self)[source]

Number of non-zero entries, equivalent to

np.count_nonzero(a.toarray())

Unlike getnnz() and the nnz property, which return the number of stored entries (the length of the data attribute), this method counts the actual number of non-zero entries in data.

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