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SDOT

       REAL FUNCTION SDOT(N,SX,INCX,SY,INCY)
       REAL SX(1),SY(1)
       INTEGER INCX,INCY,N
 C
 C     FORMS THE DOT PRODUCT OF TWO VECTORS.
 C     USES UNROLLED LOOPS FOR INCREMENTS EQUAL TO ONE.
 C     JACK DONGARRA, LINPACK, 3/11/78.
 C