RosettaCodeData/Task/Multiple-regression/Racket/multiple-regression-2.rkt

(fit (matrix [[1 2]
              [2 5]
              [3 7]
              [4 9]])
     (matrix [[1]
              [2]
              [3]
              [9]]))
{{out}}
(array #[#[9 1/3] #[-3 1/3]])