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## [Help-gsl] Multidimensional least-square-fit sought

**From**: |
Matthias Sitte |

**Subject**: |
[Help-gsl] Multidimensional least-square-fit sought |

**Date**: |
Thu, 09 Jan 2014 11:15:29 -0600 |

**User-agent**: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |

Hi,

`I'm looking for a way to to a least-square-fit to a data set (x,y,z).
``The fit function should be a polynomal like the following:
`
z(x,y) = \sum_{m,n=0,m+n<=N}^{N} c_{mn} x^m y^n
= c_{00} + c_{10} x + c_{01} y
+ c_{20} x^2 + c_{11} xy + c_{02} y^2 + ...

`I've been using GSL a lot and know my way around, but I don't know the
``terminology of least-square-fits, so I'm kindly asking you to name the
``proper function(s) I should use before I lose myself in the docs ;-)
`
Thx,
Matthias

**[Help-gsl] Multidimensional least-square-fit sought**,
*Matthias Sitte* **<=**