scipy.signal.sawtooth

scipy.signal.sawtooth(t, width=1)

Return a periodic sawtooth or triangle waveform.

The sawtooth waveform has a period 2*pi, rises from -1 to 1 on the interval 0 to width*2*pi, then drops from 1 to -1 on the interval width*2*pi to 2*pi. width must be in the interval [0, 1].

Note that this is not band-limited. It produces an infinite number of harmonics, which are aliased back and forth across the frequency spectrum.

Parameters :

t : array_like

Time.

width : array_like, optional

Width of the rising ramp as a proportion of the total cycle. Default is 1, producing a rising ramp, while 0 produces a falling ramp. t = 0.5 produces a triangle wave. If an array, causes wave shape to change over time, and must be the same length as t.

Returns :

y : ndarray

Output array containing the sawtooth waveform.

Examples

A 5 Hz waveform sampled at 500 Hz for 1 second:

>>> from scipy import signal
>>> import matplotlib.pyplot as plt
>>> t = np.linspace(0, 1, 500)
>>> plt.plot(t, signal.sawtooth(2 * np.pi * 5 * t))

(Source code)