---
name: "dlasq5"
section: "3lapack"
platform: "linux"
package: "liblapack-doc"
version: "3.2.1-8"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/dlasq5/3lapack"
---

# dlasq5(3lapack)

computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines

## NAME

DLASQ5 - computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines

## SYNOPSIS

- SUBROUTINE DLASQ5(

  I0, N0, Z, PP, TAU, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, IEEE )

- LOGICAL

  IEEE

- INTEGER

  I0, N0, PP

- DOUBLE

  PRECISION DMIN, DMIN1, DMIN2, DN, DNM1, DNM2, TAU

- DOUBLE

  PRECISION Z( \* )

## PURPOSE

DLASQ5 computes one dqds transform in ping-pong form, one version for IEEE machines another for non IEEE machines.

## ARGUMENTS

- I0 (input) INTEGER

  First index.

- N0 (input) INTEGER

  Last index.

- Z (input) DOUBLE PRECISION array, dimension ( 4\*N )

  Z holds the qd array. EMIN is stored in Z(4\*N0) to avoid an extra argument.

- PP (input) INTEGER

  PP=0 for ping, PP=1 for pong.

- TAU (input) DOUBLE PRECISION

  This is the shift.

- DMIN (output) DOUBLE PRECISION

  Minimum value of d. DMIN1 (output) DOUBLE PRECISION Minimum value of d, excluding D( N0 ). DMIN2 (output) DOUBLE PRECISION Minimum value of d, excluding D( N0 ) and D( N0-1 ).

- DN (output) DOUBLE PRECISION

  d(N0), the last value of d.

- DNM1 (output) DOUBLE PRECISION

  d(N0-1).

- DNM2 (output) DOUBLE PRECISION

  d(N0-2).

- IEEE (input) LOGICAL

  Flag for IEEE or non IEEE arithmetic.