| #### D.6.4.4 Hcode Procedure from library `classify.lib` (see classify_lib). Usage: Hcode(v); v=intvec Return: intvec, coding v according to the number of successive repetitions of an entry Example:
    LIB "classify.lib";
    intvec v1 = 1,3,5,5,2;
    Hcode(v1);
    ==> 1,0,1,0,2,0,0,1,0
    intvec v2 = 1,2,3,4,4,4,4,4,4,4,3,2,1;
    Hcode(v2);
    ==> 1,1,1,7,1,1,1

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