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## Re: linear algebra & LAPACK - questions and thoughts

**From**: |
Kacper Gutowski |

**Subject**: |
Re: linear algebra & LAPACK - questions and thoughts |

**Date**: |
Sun, 19 Apr 2020 22:02:52 +0200 |

On Sun, Apr 19, 2020 at 08:48:27PM +0200, Dr. Jürgen Sauermann wrote:

Not sure what;s wrong with your qt (character ?) since I don't have it.

This behavior is indicative of a NaN:
⊢NaN←12⎕CR17⎕CR'AAAgIAAAACAAAAABAgAAAAAAAAAAAPj/AAAAAAAAAAA='
0.000000000
0×NaN
DOMAIN ERROR
0×NaN
^ ^
(⌈/⍳0) > NaN
1
10⎕CR'NaN'
NaN←0.0000000000000000
2⎕TF'NaN'
NaN←0.0000000000000000

`Which suggests there might be some bug in one of primitives used
``to compute that value as it shouldn't be possible to create NaN in APL
``by normal means and you should get a domain error somewhere earlier.
``
`
-k

**Re: linear algebra & LAPACK - questions and thoughts**, *(continued)*
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Rowan Cannaday*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Rowan Cannaday*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Peter Teeson*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Rowan Cannaday*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Rowan Cannaday*, `2020/04/13`
**Re: linear algebra & LAPACK - questions and thoughts**, *Rowan Cannaday*, `2020/04/19`
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/19`
**Re: linear algebra & LAPACK - questions and thoughts**,
*Kacper Gutowski* **<=**
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/20`
**Re: linear algebra & LAPACK - questions and thoughts**, *Dr . Jürgen Sauermann*, `2020/04/20`