/**
* Returns the row of the item matrix corresponding to the given item.
*
* @param i item
* @return row of the item matrix
*/
public DoubleMatrix1D getItemVector(I i) {
int iidx = item2iidx(i);
if (iidx < 0) {
return null;
} else {
return itemMatrix.viewRow(iidx);
}
}
/**
* Returns the row of the user matrix corresponding to the given user.
*
* @param u user
* @return row of the user matrix
*/
public DoubleMatrix1D getUserVector(U u) {
int uidx = user2uidx(u);
if (uidx < 0) {
return null;
} else {
return userMatrix.viewRow(uidx);
}
}
