write an example of a matlab code to plot a DTMF signal using stem function

Assuming we have a DTMF signal stored in a vector called dtmf_signal, the following is an example of a MATLAB code to plot the signal using the 'stem' function:

% Define the time axis t = 0:(length(dtmf_signal)-1);

% Plot the DTMF signal using the stem function stem(t, dtmf_signal);

% Set the x-axis and y-axis labels xlabel('Time (samples)'); ylabel('Amplitude');

% Set the title of the plot title('DTMF Signal Plot');