Example of Lempel Ziv coding

[dec_cod, code_bin, code_book] = lempel_ziv(alf, str)

It's a function with three output variables and two input variables.
'dec_cod' is the decimal code that codify the input string 'str'.
'code_bin' is the binary code of the string obtained from the 'dec_cod' conversion.
'code_book' is the code-book used for the Lempel-Ziv algorithm.
'alf' is the alphabet that contains the char used to create the string 'str'.
'str' is the string to codify with the algorithm.