Quelle pkghom.gi Sprache: unbekannt

################################################################################
##
##  simpcomp / pkghom.gi
##
##  Loaded when `homology' package is available
##
##  $Id$
##
################################################################################

#setup homology package settings
SetHomologyAlgorithm(EliminateGMPAlgorithm);
SetHomologyGroupFormat(GapFormat);
HomologyInfo(0);

InstallGlobalFunction(SCHomologyClassic,
function(complex)

local hom,facets;

if(not SCIsSimplicialComplex(complex)) then
  Info(InfoSimpcomp,1,"SCHomologyClassic: first argument must be of type SCSimplicialComplex.");
  return fail;
fi;

if HasSCHomology(complex) then
  return SCHomology(complex);
fi;

if not IsBoundGlobal("SimplicialHomology") then
  return SCHomologyInternal(complex);
fi;

facets:=SCFacetsEx(complex);
if facets=fail then
  return fail;
fi;

SetHomologyAlgorithm(EliminateGMPAlgorithm);
SetHomologyGroupFormat(GapFormat);
HomologyInfo(0);
hom:=SimplicialHomology(facets);

if(hom=fail) then
  Info(InfoSimpcomp,1,"SCHomologyClassic: computing homology failed.");
  return fail;
fi;

if IsBound(hom[1]) and hom[1]=[0,[]] then
  SetSCIsConnected(complex,true);
else
  SetSCIsConnected(complex,false);
fi;

SetSCHomology(complex,hom);
return hom;
end);

Quelle pkghom.gi Sprache: unbekannt

[ Dauer der Verarbeitung: 0.19 Sekunden (vorverarbeitet) ]