idamax - return the index of the element with largest absolute value.
INTEGER FUNCTION IDAMAX(N, X, INCX) INTEGER N, INCX DOUBLE PRECISION X(*) INTEGER*8 FUNCTION IDAMAX_64(N, X, INCX) INTEGER*8 N, INCX DOUBLE PRECISION X(*) F95 INTERFACE INTEGER FUNCTION IAMAX(N, X, INCX) INTEGER :: N, INCX REAL(8), DIMENSION(:) :: X INTEGER(8) FUNCTION IAMAX_64(N, X, INCX) INTEGER(8) :: N, INCX REAL(8), DIMENSION(:) :: X C INTERFACE #include <sunperf.h> int idamax(int n, double *x, int incx); long idamax_64(long n, double *x, long incx);
Oracle Solaris Studio Performance Library idamax(3P) NAME idamax - return the index of the element with largest absolute value. SYNOPSIS INTEGER FUNCTION IDAMAX(N, X, INCX) INTEGER N, INCX DOUBLE PRECISION X(*) INTEGER*8 FUNCTION IDAMAX_64(N, X, INCX) INTEGER*8 N, INCX DOUBLE PRECISION X(*) F95 INTERFACE INTEGER FUNCTION IAMAX(N, X, INCX) INTEGER :: N, INCX REAL(8), DIMENSION(:) :: X INTEGER(8) FUNCTION IAMAX_64(N, X, INCX) INTEGER(8) :: N, INCX REAL(8), DIMENSION(:) :: X C INTERFACE #include <sunperf.h> int idamax(int n, double *x, int incx); long idamax_64(long n, double *x, long incx); PURPOSE idamax return the index of the element in x with largest absolute value where x is an n-vector. ARGUMENTS N (input) On entry, N specifies the number of elements in the vector. N must be at least one for the subroutine to have any visible effect. Unchanged on exit. X (input) ( 1 + ( n - 1 )*abs( INCX ) ). On entry, the incremented array X must contain the vector x. Unchanged on exit. INCX (input) On entry, INCX specifies the increment for the elements of X. INCX must be positive. Unchanged on exit. NOTES If the vector contains all NaNs, the function returns 1. If the vector contains valid floating point numbers and one or more NaNs, the routine returns the index of the lement containing the largest absolute value. 7 Nov 2015 idamax(3P)