void Vector::SetBlock( int i, int j, const Vector &V )
{
assert( 0 <= i && i <= j && j < size );
int n = j - i + 1;
assert( n == V.Size() );
register float *v = V.Array();
register float *e = elem + i;
for( register int k = 0; k < n; k++ ) *e++ = *v++;
}
