F06JLF (IDAMAX) computes the index of the absolutely largest component of a real vector.
F06JLF (IDAMAX) returns, via the function name, the smallest index
-element real vector scattered with stride INCX
Lawson C L, Hanson R J, Kincaid D R and Krogh F T (1979) Basic linear algebra supbrograms for Fortran usage ACM Trans. Math. Software 5 308–325