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sawtooth

Sawtooth or triangle wave

Syntax

x = sawtooth(t)
x = sawtooth(t,xmax)

Description

example

x = sawtooth(t) generates a sawtooth wave with period 2π for the elements of the time array t. sawtooth is similar to the sine function but creates a sawtooth wave with peaks of –1 and 1. The sawtooth wave is defined to be –1 at multiples of 2π and to increase linearly with time with a slope of 1/π at all other times.

x = sawtooth(t,xmax) generates a modified triangle wave with the maximum location at each period controlled by xmax.

Examples

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Generate 10 periods of a sawtooth wave with a fundamental frequency of 50 Hz. The sample rate is 1 kHz.

T = 10*(1/50);
Fs = 1000;
dt = 1/Fs;
t = 0:dt:T-dt;
x = sawtooth(2*pi*50*t);

plot(t,x)
grid on

Plot the power spectrum.

periodogram(x,[],length(x),Fs,'power')

Input Arguments

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Time array, specified as a vector, matrix, or N-D array. sawtooth operates along the first array dimension of t with size greater than 1.

Data Types: single | double

Wave maximum location, specified as a scalar between 0 and 1. xmax determines the point between 0 and 2π at which the wave reaches its maximum. The function increases from –1 to 1 on the interval 0 to 2π × xmax, then decreases linearly from 1 to –1 on the interval 2π × xmax to 2π. The shape then repeats with a period of 2π.

Example: xmax = 0.5 specifies a standard triangle wave, symmetric about time π with a peak-to-peak amplitude of 1.

Data Types: single | double

Output Arguments

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Sawtooth wave, returned as a vector, matrix, or N-D array.

Introduced before R2006a

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