i?max1

Finds the index of the vector element whose real part has maximum absolute value.

Syntax

index = icmax1( n, cx, incx )

index = izmax1( n, cx, incx )

Include Files

The FORTRAN 77 interfaces are specified in the mkl_lapack.fi include file (to be used in Fortran programs) and in the mkl_lapack.h include file (to be used in C programs).

Description

Given a complex vector cx, the i?max1 functions return the index of the vector element whose real part has maximum absolute value. These functions are based on the BLAS functions icamax/izamax, but using the absolute value of the real part. They are designed for use with clacon/zlacon.

Input Parameters

n

INTEGER. Specifies the number of elements in the vector cx.

cx

COMPLEX for icmax1

DOUBLE COMPLEX for izmax1

Array, DIMENSION at least (1+(n-1)*abs(incx)).

Contains the input vector.

incx

INTEGER. Specifies the spacing between successive elements of cx.

Output Parameters

index: INTEGER. Contains the index of the vector element whose real part has maximum absolute value.