---
name: "izamax.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/izamax.f"
---

# izamax.f(3)

## NAME

BLAS/SRC/izamax.f

## SYNOPSIS

### Functions/Subroutines

integer function **izamax** (n, zx, incx)\
 **IZAMAX**

## Function/Subroutine Documentation

### integer function izamax (integer n, complex\*16, dimension(\*) zx, integer incx)

**IZAMAX**

**Purpose:**

```
!>
!>    IZAMAX finds the index of the first element having maximum |Re(.)| + |Im(.)|
!>
```

**Parameters**

*N*

```
!>          N is INTEGER
!>         number of elements in input vector(s)
!>
```

*ZX*

```
!>          ZX is COMPLEX*16 array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
!>
```

*INCX*

```
!>          INCX is INTEGER
!>         storage spacing between elements of ZX
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Further Details:**

```
!>
!>     jack dongarra, 1/15/85.
!>     modified 3/93 to return if incx .le. 0.
!>     modified 12/3/93, array(1) declarations changed to array(*)
!>
```

Definition at line **70** of file **izamax.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.