How HMM viterbi algorithm works

Hi al,

I am new in using HMM so I have created a simple example, where a random sequence is generated and then the states are updated through viterbi algorithm (https://www.mathworks.com/help/stats/hmmviterbi.html).

However, from my understanding it seems that viterbi updates the states for a given sequence!

So it means that the sequence remains the same and only the states are updated? If you have any good reference example besides the one on the matlab website, it would b really helpful.

thanks in advance,

Nikolas