# i?amin

Finds the index of the element with the smallest absolute value.

## Syntax

FORTRAN 77:

index = isamin(n, x, incx )

index = idamin(n, x, incx )

index = icamin(n, x, incx )

index = izamin(n, x, incx )

Fortran 95:

index = iamin(x)

## Description

Given a vector x, the i?amin functions return the position of the vector element `x(i)` that has the smallest absolute value for real dlavors, or the smallest sum `|Re(x(i))|+|Im(x(i))|` for complex flavors.

If n is not positive, `0` is returned.

If more than one vector element is found with the same smallest absolute value, the index of the first one encountered is returned.

## Input Parameters

n

  INTEGER. On entry, n specifies the order of the vector x.

x

  REAL for isamin

  DOUBLE PRECISION for idamin

  COMPLEX for icamin

  DOUBLE COMPLEX for izamin

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

incx

  INTEGER. Specifies the increment for the elements of x.

## Output Parameters

index

  INTEGER. Contains the position of vector element x that has the smallest absolute value.

## Fortran 95 Interface Notes

Routines in Fortran 95 interface have fewer arguments in the calling sequence than their FORTRAN 77 counterparts. For general conventions applied to skip redundant or reconstructible arguments, see Fortran 95 Interface Conventions.

Specific details for the routine iamin interface are the following:

x

  Holds the vector of length (n).

Parent topic: BLAS Level 1 Routines