# slasq6.f man page

slasq6.f

## Synopsis

### Functions/Subroutines

subroutine **slasq6** (I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)**SLASQ6** computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

## Function/Subroutine Documentation

### subroutine slasq6 (integer I0, integer N0, real, dimension( * ) Z, integer PP, real DMIN, real DMIN1, real DMIN2, real DN, real DNM1, real DNM2)

**SLASQ6** computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

**Purpose:**

SLASQ6 computes one dqd (shift equal to zero) transform in ping-pong form, with protection against underflow and overflow.

**Parameters:**-
*I0*I0 is INTEGER First index.

*N0*N0 is INTEGER Last index.

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

*PP*PP is INTEGER PP=0 for ping, PP=1 for pong.

*DMIN*DMIN is REAL Minimum value of d.

*DMIN1*DMIN1 is REAL Minimum value of d, excluding D( N0 ).

*DMIN2*DMIN2 is REAL Minimum value of d, excluding D( N0 ) and D( N0-1 ).

*DN*DN is REAL d(N0), the last value of d.

*DNM1*DNM1 is REAL d(N0-1).

*DNM2*DNM2 is REAL d(N0-2).

**Author:**-
Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**December 2016

Definition at line 121 of file slasq6.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page slasq6(3) is an alias of slasq6.f(3).

Tue Nov 14 2017 Version 3.8.0 LAPACK