# slasq6.f man page

slasq6.f —

## Synopsis

### Functions/Subroutines

subroutineslasq6(I0, N0, Z, PP, DMIN, DMIN1, DMIN2, DN, DNM1, DNM2)SLASQ6computes one dqd transform in ping-pong form. Used by sbdsqr and sstegr.

## Function/Subroutine Documentation

### subroutine slasq6 (integerI0, integerN0, real, dimension( * )Z, integerPP, realDMIN, realDMIN1, realDMIN2, realDN, realDNM1, realDNM2)

**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:**

September 2012

Definition at line 119 of file slasq6.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

slasq6(3) is an alias of slasq6.f(3).