Listing 1.7, line 28, change of global variable lead to an implicit convention to local variable

[curow]

change the 28th line to

global state = sample(1:3,weights(P[state,:]))

will eliminate the UndefVarError: state not defined Error.

This error is due to Julia's Weird Convention for writing to a global variable.
here is a more clear explain at Stack Overflow

[h-Klok]

Thank you for the find, the codes been fixed :)

[VincentTam]

@h-Klok Just a suggestion. Mentioning the issue (by typing #2) in your Git commit title/message would allow easier tracking.