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## how to solve triangular systems

**From**: |
Federico Poloni |

**Subject**: |
how to solve triangular systems |

**Date**: |
Sun, 05 Nov 2006 13:07:18 +0100 |

**User-agent**: |
Thunderbird 1.5.0.7 (X11/20060915) |

Hi everyone,
sorry to bother this mailing list but I don't seem to find this
anywhere in the docs.
about operators \ and / :
When the system matrix is diagonal or triangular does Octave solve it in
"the smart way" (using O(n) and O(n^2) flops respectively)? Which other
structures are recognized and supported by these operators (for example,
matlab says it recognizes permuted-triangular systems)?
If the answer to the first question is no, then:
Has Octave a "standard" way to solve triangular systems, or does one
have to write back-substitution from scratch every time?
Thanks in advance,
--federico poloni

**how to solve triangular systems**,
*Federico Poloni* **<=**