22.3 Function that Modify Boolean Lists

UniteBlist unites the boolean list blist1 with the boolean list blist2, which must have the same length. This is equivalent to assigning blist1[i] := blist1[i] or blist2[i] for all i. UniteBlist returns nothing, it is only called to change blist1.

gap> blist1 := [ true, true, false, false ];;
gap> blist2 := [ true, false, true, false ];;
gap> UniteBlist( blist1, blist2 );
gap> blist1;
[ true, true, true, false ] 

The function UnionBlist (see UnionBlist) is the nondestructive counterpart to the procedure UniteBlist.

intersects the boolean list blist1 with the boolean list blist2, which must have the same length. This is equivalent to assigning blist1[i]:= blist1[i] and blist2[i] for all i. IntersectBlist returns nothing, it is only called to change blist1.

gap> blist1 := [ true, true, false, false ];;
gap> blist2 := [ true, false, true, false ];;
gap> IntersectBlist( blist1, blist2 );
gap> blist1;
[ true, false, false, false ] 

The function IntersectionBlist (see IntersectionBlist) is the nondestructive counterpart to the procedure IntersectBlist.

subtracts the boolean list blist2 from the boolean list blist1, which must have equal length. This is equivalent to assigning blist1[i] := blist1[i] and not blist2[i] for all i. SubtractBlist returns nothing, it is only called to change blist1.

gap> blist1 := [ true, true, false, false ];;
gap> blist2 := [ true, false, true, false ];;
gap> SubtractBlist( blist1, blist2 );
gap> blist1;
[ false, true, false, false ] 

The function DifferenceBlist (see DifferenceBlist) is the nondestructive counterpart to the procedure SubtractBlist.

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