call MPI_TYPE_VECTOR(count,blocklength,stride,oldtype,newtype,ierr)
	               |        |         |      |       |      | 
	            number   number    spacing   |      new     |
                      of       of      between   |   datatype   |
	            blocks  oldtype    start of  |              |
			    elements     each    |            error
			    in each     block    |
	                     block    (in oldtype|
		                       elements) |
                                                old 
					     datatype