idamax

idamax() int idamax ( int  n, double  x[], int  incx  ) Index of the first element having maximum absolute value (BLAS 1) Purpose This routine finds the index of the first element having maximum absolute value. Returns The index of the first element having maximum absolute value of input vector. Parameters [in] n Number of elements in input vector. [in] x[] Array x[lx] (lx >= 1 + (n - 1)*abs(incx)) Input vector x. [in] incx Storage spacing between elements of x. Reference BLAS