void splitClass(GArgReader& args)
{
const char* filename = args.pop_string();
GMatrix* pData = loadData(filename);
Holder<GMatrix> hData(pData);
size_t classAttr = args.pop_uint();
bool dropClass = false;
while(args.size() > 0)
{
if(args.if_pop("-dropclass"))
dropClass = true;
else
ThrowError("Invalid option: ", args.peek());
}
for(size_t i = 0; i < pData->relation()->valueCount(classAttr); i++)
{
GMatrix tmp(pData->relation(), pData->heap());
pData->splitByNominalValue(&tmp, classAttr, i);
std::ostringstream oss;
PathData pd;
GFile::parsePath(filename, &pd);
string fn;
fn.assign(filename + pd.fileStart, pd.extStart - pd.fileStart);
oss << fn << "_";
pData->relation()->printAttrValue(oss, classAttr, (double)i);
oss << ".arff";
string s = oss.str();
if(dropClass)
tmp.deleteColumn(classAttr);
tmp.saveArff(s.c_str());
}
}
