GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#(C) Graham Ellis, 2005-2006 ##################################################################### ##################################################################### DeclareCategory("IsHapSparseMat",IsObject); DeclareRepresentation( "IsHapSparseMatRep", IsComponentObjectRep, ["rows", "cols", "characteristic", "mat", ]); HapSparseMatFamily:=NewFamily( "HapSparseMatFamily", IsHapSparseMat, IsHapSparseMat); HapSparseMat:=NewType(HapSparseMatFamily,IsHapSparseMatRep); InstallMethod( ViewObj, "for HapSparseMat", [IsHapSparseMat], function(M) Print("Sparse matrix with ", M!.rows, " rows and ", M!.cols, " columns in characteristic ", M!.characteristic,"\n"); end); InstallMethod( PrintObj, "for HapSparseMat", [IsHapSparseMat], function(M) Print("Sparse matrix with ", M!.rows, " rows and ", M!.cols, " columns in characteristic ", M!.characteristic,"\n"); end); ##################################################################### #####################################################################