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librosa.util.pad_center¶

librosa.util.pad_center(data, size, axis=- 1, **kwargs)[source]¶

Pad an array to a target length along a target axis.

This differs from np.pad by centering the data prior to padding, analogous to str.center

Parameters

datanp.ndarray: Vector to be padded and centered
sizeint >= len(data) [scalar]: Length to pad data
axisint: Axis along which to pad and center the data
kwargsadditional keyword arguments: arguments passed to np.pad

Returns

data_paddednp.ndarray: data centered and padded to length size along the specified axis

Raises

ParameterError: If size < data.shape[axis]

See also

numpy.pad

Examples

>>> # Generate a vector
>>> data = np.ones(5)
>>> librosa.util.pad_center(data, 10, mode='constant')
array([ 0.,  0.,  1.,  1.,  1.,  1.,  1.,  0.,  0.,  0.])

>>> # Pad a matrix along its first dimension
>>> data = np.ones((3, 5))
>>> librosa.util.pad_center(data, 7, axis=0)
array([[ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  0.],
       [ 1.,  1.,  1.,  1.,  1.],
       [ 1.,  1.,  1.,  1.,  1.],
       [ 1.,  1.,  1.,  1.,  1.],
       [ 0.,  0.,  0.,  0.,  0.],
       [ 0.,  0.,  0.,  0.,  0.]])
>>> # Or its second dimension
>>> librosa.util.pad_center(data, 7, axis=1)
array([[ 0.,  1.,  1.,  1.,  1.,  1.,  0.],
       [ 0.,  1.,  1.,  1.,  1.,  1.,  0.],
       [ 0.,  1.,  1.,  1.,  1.,  1.,  0.]])