I am currently reading through examples on how to display wav files in Matlab and I came across this example, but I am not sure what the arguments reprent inside the plot function:

Create this figure in Matlab:

$x = $wavread(‘horn.wav’);

plot$(x(:, 1));$

plot$(x(4000:10000, 1));$

What does **$x(4000:10000, 1)$** do inside the plot?