---
name: "icmax1.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/icmax1.f"
---

# icmax1.f(3)

## NAME

SRC/icmax1.f

## SYNOPSIS

### Functions/Subroutines

integer function **icmax1** (n, cx, incx)\
 **ICMAX1** finds the index of the first vector element of maximum absolute value.

## Function/Subroutine Documentation

### integer function icmax1 (integer n, complex, dimension(\*) cx, integer incx)

**ICMAX1** finds the index of the first vector element of maximum absolute value.

**Purpose:**

```
!>
!> ICMAX1 finds the index of the first vector element of maximum absolute value.
!>
!> Based on ICAMAX from Level 1 BLAS.
!> The change is to use the 'genuine' absolute value.
!>
```

**Parameters**

*N*

```
!>          N is INTEGER
!>          The number of elements in the vector CX.
!>
```

*CX*

```
!>          CX is COMPLEX array, dimension (N)
!>          The vector CX. The ICMAX1 function returns the index of its first
!>          element of maximum absolute value.
!>
```

*INCX*

```
!>          INCX is INTEGER
!>          The spacing between successive values of CX.  INCX >= 1.
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Contributors:**

Nick Higham for use with CLACON.

Definition at line **80** of file **icmax1.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.