RowsStore(final MatrixStore<N> aBase, final int... someRows) {
super(someRows.length, (int) aBase.countColumns(), aBase);
myRows = someRows;
myFirst = 0;
}
RowsStore(final int aFirst, final int aLimit, final MatrixStore<N> aBase) {
super(aLimit - aFirst, (int) aBase.countColumns(), aBase);
myRows = null;
myFirst = aFirst;
}