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## [Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-

**From**: |
Archisman Panigrahi |

**Subject**: |
[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices |

**Date**: |
Tue, 11 Aug 2020 02:06:27 -0400 (EDT) |

**User-agent**: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:75.0) Gecko/20100101 Firefox/75.0 |

Follow-up Comment #9, bug #58926 (project octave):
[comment #7 comment #7:]
>* BTW, independent of the BLAS and OMP question, you can speed up the rest of*
your code with vectorization:
>* *
>* *
>* octave:21> clear a b c d*
>* octave:22> tic; for a = 1:500, for b = 1:500, c(a,b) = sin(a + b^2); endfor;*
endfor; toc
>* Elapsed time is 0.85335 seconds.*
>* octave:23> tic; d = sin((1:500)' + (1:500).^2); toc*
>* Elapsed time is 0.00294185 seconds.*
>* octave:24> assert(all(all(c==d)))*
>* octave:25> *
>* *
>* *
>* It's roughly 290 times faster to avoid the for-loops in this case (853 ms vs*
3 ms).
Thank you, I did not know about this technique.
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**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/10`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Kai Torben Ohlhus*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**,
*Archisman Panigrahi* **<=**
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Kai Torben Ohlhus*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Kai Torben Ohlhus*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Dmitri A. Sergatskov*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Archisman Panigrahi*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *Dmitri A. Sergatskov*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/11`
**[Octave-bug-tracker] [bug #58926] Octave gives wrong results with intel-mkl when diagonalizing large matrices**, *anonymous*, `2020/08/11`