def _init_spmatrix(self, data, index, columns, dtype=None,
fill_value=None):
"""
Init self from scipy.sparse matrix.
"""
index, columns = SparseFrameAccessor._prep_index(data, index, columns)
data = data.tocoo()
N = len(index)
# Construct a dict of SparseSeries
sdict = {}
values = Series(data.data, index=data.row, copy=False)
for col, rowvals in values.groupby(data.col):
# get_blocks expects int32 row indices in sorted order
rowvals = rowvals.sort_index()
rows = rowvals.index.values.astype(np.int32)
blocs, blens = get_blocks(rows)
sdict[columns[col]] = SparseSeries(
rowvals.values, index=index,
fill_value=fill_value,
sparse_index=BlockIndex(N, blocs, blens))
# Add any columns that were empty and thus not grouped on above
sdict.update({column: SparseSeries(index=index,
fill_value=fill_value,
sparse_index=BlockIndex(N, [], []))
for column in columns
if column not in sdict})
return self._init_dict(sdict, index, columns, dtype)
def _init_spmatrix(self, data, index, columns, dtype=None,
fill_value=None):
"""
Init self from scipy.sparse matrix.
"""
index, columns = SparseFrameAccessor._prep_index(data, index, columns)
data = data.tocoo()
N = len(index)
# Construct a dict of SparseSeries
sdict = {}
values = Series(data.data, index=data.row, copy=False)
for col, rowvals in values.groupby(data.col):
# get_blocks expects int32 row indices in sorted order
rowvals = rowvals.sort_index()
rows = rowvals.index.values.astype(np.int32)
blocs, blens = get_blocks(rows)
sdict[columns[col]] = SparseSeries(
rowvals.values, index=index,
fill_value=fill_value,
sparse_index=BlockIndex(N, blocs, blens))
# Add any columns that were empty and thus not grouped on above
sdict.update({column: SparseSeries(index=index,
fill_value=fill_value,
sparse_index=BlockIndex(N, [], []))
for column in columns
if column not in sdict})
return self._init_dict(sdict, index, columns, dtype)
def _init_matrix(self, data, index, columns, dtype=None):
"""
Init self from ndarray or list of lists.
"""
data = prep_ndarray(data, copy=False)
index, columns = SparseFrameAccessor._prep_index(data, index, columns)
data = {idx: data[:, i] for i, idx in enumerate(columns)}
return self._init_dict(data, index, columns, dtype)
def _init_matrix(self, data, index, columns, dtype=None):
"""
Init self from ndarray or list of lists.
"""
data = prep_ndarray(data, copy=False)
index, columns = SparseFrameAccessor._prep_index(data, index, columns)
data = {idx: data[:, i] for i, idx in enumerate(columns)}
return self._init_dict(data, index, columns, dtype)
def to_dense(self):
return SparseFrameAccessor(self).to_dense()
def to_coo(self):
return SparseFrameAccessor(self).to_coo()