Equivalent of -agglofrom for the library

Hi,

I've been testing cluto from the command line. I'd used vcluster and the direct method plus the -agglofrom parameter:
[vcluster.exe -zscores -rowmodel=none -colmodel=none -clustfile=Sortie.txt Entree.mat -agglofrom=10 -clmethod=direct 6].

Is there a way to still use the direct method and the agglofrom parameter from the library interface? The CLUTO_VP_ClusterDirect seems to be the right function but I can't find how to pass an "agglofrom" parameter value.

Regards,

Michael