Notes for SET

1. Performs $ x \leftarrow \alpha $
2. An index file input line looks like:

   <ID> <alpha> <incX> <source file> <author name>
   

3. For complex, if incX == 1, and the imaginary component of alpha is the same as the real component, the real routine is called with N*2.
4. alpha == 0.0 is heavily used in some codes.