To test the tools, we need to generate HMM output
data from the above-defined model.
Execute the script file
software/hmm_example.m. The program
calls the function
software/hmm_maketestdata.mwhich generates the 2-dimensional feature data
as described above. The call is
There are 10 records of length 400 segments,
thus x is size 2-by-4000.
The auxiliary outputs istart,nsamp
are vectors containing the starting samples
and lengths of each of the ten records.
This makes it possible to locate individual records within
The script then plots the data using the command
and waits for keyboard input.
The resulting figure is shown in Figure 13.21.
Scatter plot of the HMM output features. The three
states can be seen individually. Compare the plot with
the table of means and standard deviations.