izamax (3p)

Name

izamax - return the index of the element with largest absolute value.

Synopsis

INTEGER FUNCTION IZAMAX(N, X, INCX)

DOUBLE COMPLEX X(*)
INTEGER N, INCX

INTEGER*8 FUNCTION IZAMAX_64(N, X, INCX)

DOUBLE COMPLEX X(*)
INTEGER*8 N, INCX




F95 INTERFACE
INTEGER FUNCTION IAMAX(N, X, INCX)

COMPLEX(8), DIMENSION(:) :: X
INTEGER :: N, INCX

INTEGER(8) FUNCTION IAMAX_64(N, X, INCX)

COMPLEX(8), DIMENSION(:) :: X
INTEGER(8) :: N, INCX




C INTERFACE
#include <sunperf.h>

int izamax(int n, doublecomplex *x, int incx);

long izamax_64(long n, doublecomplex *x, long incx);

Description

Oracle Solaris Studio Performance Library                           izamax(3P)



NAME
       izamax - return the index of the element with largest absolute value.


SYNOPSIS
       INTEGER FUNCTION IZAMAX(N, X, INCX)

       DOUBLE COMPLEX X(*)
       INTEGER N, INCX

       INTEGER*8 FUNCTION IZAMAX_64(N, X, INCX)

       DOUBLE COMPLEX X(*)
       INTEGER*8 N, INCX




   F95 INTERFACE
       INTEGER FUNCTION IAMAX(N, X, INCX)

       COMPLEX(8), DIMENSION(:) :: X
       INTEGER :: N, INCX

       INTEGER(8) FUNCTION IAMAX_64(N, X, INCX)

       COMPLEX(8), DIMENSION(:) :: X
       INTEGER(8) :: N, INCX




   C INTERFACE
       #include <sunperf.h>

       int izamax(int n, doublecomplex *x, int incx);

       long izamax_64(long n, doublecomplex *x, long incx);



PURPOSE
       izamax return the index of the element in x with largest absolute value
       where x is an n-vector and absolute value is defined as the sum of  the
       absolute value of the real part and the absolute value of the imaginary
       part.


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 double complex numbers and one or more NaNs, the routine
       returns the index of the element containing the largest absolute value.



                                  7 Nov 2015                        izamax(3P)