Singular Manual: memberpos

| #### D.2.9.2 memberpos Procedure from library `redcgs.lib` (see redcgs_lib). Usage: memberpos(f,J); (f,J) expected (polynomial,ideal) or (int,list(int)) or (int,intvec) or (intvec,list(intvec)) or (list(int),list(list(int))) or (ideal,list(ideal)) or (list(intvec), list(list(intvec))). The ring can be @R or @P or @RP or any other. Return: The list (t,pos) t int; pos int; t is 1 if f belongs to J and 0 if not. pos gives the position in J (or 0 if f does not belong). Example:
    LIB "redcgs.lib";
    list L=(7,4,5,1,1,4,9);
    memberpos(1,L);
    ==> [1]:
    ==>    1
    ==> [2]:
    ==>    4

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