29.11 SubtractBlist

SubtractBlist( blist1, blist2 )

SubtractBlist 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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