getVector method
Read row i as a fresh Vector (copy). Mainly for tests.
Implementation
Vector getVector(int i) {
if (i < 0 || i >= _ids.length) {
throw RangeError.index(i, _ids, 'i', null, _ids.length);
}
final out = Float32List(dim);
out.setRange(0, dim, _data, i * dim);
return Vector(out);
}