librosa.display.TimeFormatter

class librosa.display.TimeFormatter(lag=False, unit=None)

A tick formatter for time axes.

Automatically switches between seconds, minutes:seconds, or hours:minutes:seconds.

Parameters:

lagbool

If True, then the time axis is interpreted in lag coordinates. Anything past the midpoint will be converted to negative time.

unitstr or None

Abbreviation of the string representation for axis labels and ticks. List of supported units: * “h”: hour-based format (H:MM:SS) * “m”: minute-based format (M:SS) * “s”: second-based format (S.sss in scientific notation) * “ms”: millisecond-based format (s.µµµ in scientific notation) * None: adaptive to the duration of the underlying time range: similar to “h” above 3600 seconds; to “m” between 60 and 3600 seconds; to “s” between 1 and 60 seconds; and to “ms” below 1 second.

See also

matplotlib.ticker.Formatter

Examples

For normal time

>>> import matplotlib.pyplot as plt
>>> times = np.arange(30)
>>> values = np.random.randn(len(times))
>>> fig, ax = plt.subplots()
>>> ax.plot(times, values)
>>> ax.xaxis.set_major_formatter(librosa.display.TimeFormatter())
>>> ax.set(xlabel='Time')

Manually set the physical time unit of the x-axis to milliseconds

>>> times = np.arange(100)
>>> values = np.random.randn(len(times))
>>> fig, ax = plt.subplots()
>>> ax.plot(times, values)
>>> ax.xaxis.set_major_formatter(librosa.display.TimeFormatter(unit='ms'))
>>> ax.set(xlabel='Time (ms)')

For lag plots

>>> times = np.arange(60)
>>> values = np.random.randn(len(times))
>>> fig, ax = plt.subplots()
>>> ax.plot(times, values)
>>> ax.xaxis.set_major_formatter(librosa.display.TimeFormatter(lag=True))
>>> ax.set(xlabel='Lag')

__init__(lag=False, unit=None)

Methods

__init__([lag, unit])
create_dummy_axis(**kwargs)
fix_minus(s)	Some classes may want to replace a hyphen for minus with the proper Unicode symbol (U+2212) for typographical correctness. This is a helper method to perform such a replacement when it is enabled via :rc:`axes.unicode_minus`.
format_data(value)	Return the full string representation of the value with the position unspecified.
format_data_short(value)	Return a short string version of the tick value.
format_ticks(values)	Return the tick labels for all the ticks at once.
get_offset()
set_axis(axis)
set_locs(locs)	Set the locations of the ticks.

Attributes

axis
locs