void append_const(double const_to_add) {
int r_num = m_feat.rowNum()+1, c_num = m_feat.colNum();
m_feat.resize(r_num, c_num);
int col;
for (col = 0; col < c_num; ++col) {
AzIFarr ifa;
m_feat.col(col)->nonZero(&ifa);
ifa.put(r_num-1, const_to_add);
m_feat.col_u(col)->load(&ifa);
}
}
inline int colNum() const {
if (md != NULL) return md->colNum();
if (ms != NULL) return ms->colNum();
return 0;
}
inline int size() const { return m_feat.colNum(); }
