Developer Reference for Intel® oneAPI Math Kernel Library for Fortran

ID 766686
Date 12/16/2022
Public

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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
  • mkl.fi
Description

Given a complex vector cx, the i?max1 functions return the index of the first vector element of maximum absolute value. These functions are based on the BLAS functions icamax/izamax, but using the absolute value of components. 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, size 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. Index of the vector element of maximum absolute value.