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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
Project: cocalc-sagemath-dev-slelievre
Views: 418346gap> START_TEST("HAP library");
gap> M:=ReadImageAsPureCubicalComplex(Concatenation(dir,"image1.3.3.eps"),300);;
gap> while BettiNumber(PureComplexComplement(M),0)>1 do
> M:=ThickenedPureComplex(M);
> od;
gap> F:=ConcentricFiltration(ComplementOfPureComplex(M),20);
Filtered Pure Cubical Complex of Dimension 2.
gap> P:=PersistentBettiNumbers(F,0);;
gap> BarCodeCompactDisplay(P);;
gap> STOP_TEST( "tst.tst", 1000 );