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## Re: [Help-gsl] How to solve a linear equation system with left (lower) t

**From**: |
Brian Gough |

**Subject**: |
Re: [Help-gsl] How to solve a linear equation system with left (lower) triangle matrix in gsl? |

**Date**: |
Tue, 13 Mar 2007 17:35:38 +0000 |

**User-agent**: |
Wanderlust/2.14.0 (Africa) Emacs/21.3 Mule/5.0 (SAKAKI) |

At Mon, 12 Mar 2007 04:26:22 +0100,
Alexander Morgenstern wrote:
>* *
>* Now my (hopefully not too stupid) question: I want to solve a linear*
>* equation system of the form:*
>* *
>* Lx = b*
>* *
>* With L being a left (lower) triangle matrix....*
Hello,
There is a blas function gsl_blas_dtrsv that solves for upper or lower
triangular matrices, e.g.
gsl_vector_memcpy(x, b); /* x <- b */
gsl_blas_dtrsv (CblasLower, CblasNoTrans, CblasUnit, L, x;)
See the documentation for more details.
--
best regards,
Brian Gough
(GSL Maintainer)
Network Theory Ltd,
Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/