plot triangle wave peak at 1 for 0.25 second then zero for 0.125 then -1 for 0.25 second then zero for (3*0.125) in matlab

To plot a triangle wave with the given specifications, you can use the sawtooth function in MATLAB. The sawtooth function generates a symmetric triangle wave with a period of 2π by default, and you can modify it to match the desired frequency and duration.

Here's an example MATLAB code to plot the triangle wave with the given specifications:

main.m
% Define the time intervals and durations
t1 = 0:0.01:0.25;          % 0.25 second duration
t2 = 0.25:0.01:0.375;      % 0.125 second duration
t3 = 0.375:0.01:0.625;     % 0.25 second duration
t4 = 0.625:0.01:1.125;     % 0.5 second duration

% Generate the triangle wave values
y1 = sawtooth(4*pi*t1);    % 1 Hz frequency (1 period in 1 second)
y2 = zeros(size(t2));      % 0 value
y3 = -sawtooth(4*pi*t3);   % 1 Hz frequency (1 period in 1 second)
y4 = zeros(size(t4));      % 0 value

% Concatenate the time intervals and waveform values
t = [t1 t2 t3 t4];
y = [y1 y2 y3 y4];

% Plot the triangle wave
plot(t, y);
xlabel('Time (s)');
ylabel('Amplitude');
title('Triangle Wave');
grid on;
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In this code, we divide the time axis into four intervals based on the specified durations. Then, we use the sawtooth function to generate the triangle wave values for each interval. The values in between the intervals are set to zero.

Finally, we concatenate the time intervals and waveform values and plot the resulting triangle wave.

Note: The code snippet above assumes a sampling rate of 100 Hz (0.01 sec per sample). You may need to adjust the step size (0.01) and the number of samples based on your desired time resolution.

Hope this helps!