Multidimensional vector fitting

ROOT
1

Hello, I have the following problem:

Vector1(5dim)*A(matrix)=Vector2(5dim)

(Vector1 (i), Vector2 (i)) are my data points with different errors, and i is the number of points. Vector 1 and 2 have 5 components. I would like to find matrix A by minimizing chi2.
Does anyone knows how to perform this fitting? I was not able to find any similar example.

Thanks in advance.
Best regards,
Jeremias

ROOT Version: 5.34/30
Platform: Ubuntu 16.04

2

If , for each data point i, you have a single value, you can just use the TGraph or TGraphError classes and do
TGraph::Fit

Otherwise you can just write yourself the Chi2 function and use Minuit to minimise as a standard multidimensional function

Lorenzo

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