librosa.util.index_to_slice¶
- librosa.util.index_to_slice(idx, idx_min=None, idx_max=None, step=None, pad=True)¶
Generate a slice array from an index array.
Parameters: idx : list-like
Array of index boundaries
idx_min : None or int
idx_max : None or int
Minimum and maximum allowed indices
step : None or int
Step size for each slice. If None, then the default step of 1 is used.
pad : boolean
If True, pad idx to span the range idx_min:idx_max.
Returns: slices : list of slice
slices[i] = slice(idx[i], idx[i+1], step) Additional slice objects may be added at the beginning or end, depending on whether pad==True and the supplied values for idx_min and idx_max.
See also
Examples
>>> # Generate slices from spaced indices >>> librosa.util.index_to_slice(np.arange(20, 100, 15)) [slice(20, 35, None), slice(35, 50, None), slice(50, 65, None), slice(65, 80, None), slice(80, 95, None)] >>> # Pad to span the range (0, 100) >>> librosa.util.index_to_slice(np.arange(20, 100, 15), ... idx_min=0, idx_max=100) [slice(0, 20, None), slice(20, 35, None), slice(35, 50, None), slice(50, 65, None), slice(65, 80, None), slice(80, 95, None), slice(95, 100, None)] >>> # Use a step of 5 for each slice >>> librosa.util.index_to_slice(np.arange(20, 100, 15), ... idx_min=0, idx_max=100, step=5) [slice(0, 20, 5), slice(20, 35, 5), slice(35, 50, 5), slice(50, 65, 5), slice(65, 80, 5), slice(80, 95, 5), slice(95, 100, 5)]