How to change that Julia variable:
22×17 Matrix{NamedTuple{(:threshold, :nr_of_bikes, :sr_brak_na_dzien, :sr_przewoz_na_dzien), Tuple{Int64, Int64, Float64, Float64}}}:
 (threshold = 4, nr_of_bikes = 4, sr_brak_na_dzien = 0.16, sr_przewoz_na_dzien = 0.32)   …  (threshold = 4, nr_of_bikes = 20, sr_brak_na_dzien = 0.46, sr_przewoz_na_dzien = 0.2)
 (threshold = 5, nr_of_bikes = 4, sr_brak_na_dzien = 0.08, sr_przewoz_na_dzien = 0.2)       (threshold = 5, nr_of_bikes = 20, sr_brak_na_dzien = 0.34, sr_przewoz_na_dzien = 0.2)
 (threshold = 6, nr_of_bikes = 4, sr_brak_na_dzien = 0.1, sr_przewoz_na_dzien = 0.2)        (threshold = 6, nr_of_bikes = 20, sr_brak_na_dzien = 0.58, sr_przewoz_na_dzien = 0.2)
 (threshold = 7, nr_of_bikes = 4, sr_brak_na_dzien = 0.1, sr_przewoz_na_dzien = 0.2)        (threshold = 7, nr_of_bikes = 20, sr_brak_na_dzien = 0.58, sr_przewoz_na_dzien = 0.2)
 (threshold = 8, nr_of_bikes = 4, sr_brak_na_dzien = 0.0, sr_przewoz_na_dzien = 0.2)        (threshold = 8, nr_of_bikes = 20, sr_brak_na_dzien = 0.12, sr_przewoz_na_dzien = 0.2)
 (threshold = 9, nr_of_bikes = 4, sr_brak_na_dzien = 0.12, sr_przewoz_na_dzien = 0.2)    …  (threshold = 9, nr_of_bikes = 20, sr_brak_na_dzien = 0.1, sr_przewoz_na_dzien = 0.22)
 (threshold = 10, nr_of_bikes = 4, sr_brak_na_dzien = 0.08, sr_przewoz_na_dzien = 0.2)      (threshold = 10, nr_of_bikes = 20, sr_brak_na_dzien = 0.16, sr_przewoz_na_dzien = 0.2)
 (threshold = 11, nr_of_bikes = 4, sr_brak_na_dzien = 0.14, sr_przewoz_na_dzien = 0.2)      (threshold = 11, nr_of_bikes = 20, sr_brak_na_dzien = 0.28, sr_przewoz_na_dzien = 0.2)
 (threshold = 12, nr_of_bikes = 4, sr_brak_na_dzien = 0.16, sr_przewoz_na_dzien = 0.2)      (threshold = 12, nr_of_bikes = 20, sr_brak_na_dzien = 0.18, sr_przewoz_na_dzien = 0.22)
 (threshold = 13, nr_of_bikes = 4, sr_brak_na_dzien = 0.48, sr_przewoz_na_dzien = 0.2)      (threshold = 13, nr_of_bikes = 20, sr_brak_na_dzien = 0.08, sr_przewoz_na_dzien = 0.1)
 (threshold = 14, nr_of_bikes = 4, sr_brak_na_dzien = 0.16, sr_przewoz_na_dzien = 0.12)  …  (threshold = 14, nr_of_bikes = 20, sr_brak_na_dzien = 0.18, sr_przewoz_na_dzien = 0.1)
 (threshold = 15, nr_of_bikes = 4, sr_brak_na_dzien = 0.0, sr_przewoz_na_dzien = 0.02)      (threshold = 15, nr_of_bikes = 20, sr_brak_na_dzien = 0.5, sr_przewoz_na_dzien = 0.08)
 (threshold = 16, nr_of_bikes = 4, sr_brak_na_dzien = 0.12, sr_przewoz_na_dzien = 0.1)      (threshold = 16, nr_of_bikes = 20, sr_brak_na_dzien = 0.12, sr_przewoz_na_dzien = 0.06)
 (threshold = 17, nr_of_bikes = 4, sr_brak_na_dzien = 0.28, sr_przewoz_na_dzien = 0.02)     (threshold = 17, nr_of_bikes = 20, sr_brak_na_dzien = 0.2, sr_przewoz_na_dzien = 0.06)
 (threshold = 18, nr_of_bikes = 4, sr_brak_na_dzien = 0.0, sr_przewoz_na_dzien = 0.08)      (threshold = 18, nr_of_bikes = 20, sr_brak_na_dzien = 0.42, sr_przewoz_na_dzien = 0.08)
 (threshold = 19, nr_of_bikes = 4, sr_brak_na_dzien = 0.66, sr_przewoz_na_dzien = 0.04)  …  (threshold = 19, nr_of_bikes = 20, sr_brak_na_dzien = 0.16, sr_przewoz_na_dzien = 0.04)
 (threshold = 20, nr_of_bikes = 4, sr_brak_na_dzien = 0.3, sr_przewoz_na_dzien = 0.0)       (threshold = 20, nr_of_bikes = 20, sr_brak_na_dzien = 0.58, sr_przewoz_na_dzien = 0.04)
 (threshold = 21, nr_of_bikes = 4, sr_brak_na_dzien = 0.22, sr_przewoz_na_dzien = 0.04)     (threshold = 21, nr_of_bikes = 20, sr_brak_na_dzien = 0.04, sr_przewoz_na_dzien = 0.1)
 (threshold = 22, nr_of_bikes = 4, sr_brak_na_dzien = 0.46, sr_przewoz_na_dzien = 0.0)      (threshold = 22, nr_of_bikes = 20, sr_brak_na_dzien = 0.46, sr_przewoz_na_dzien = 0.0)
 (threshold = 23, nr_of_bikes = 4, sr_brak_na_dzien = 0.5, sr_przewoz_na_dzien = 0.0)       (threshold = 23, nr_of_bikes = 20, sr_brak_na_dzien = 0.24, sr_przewoz_na_dzien = 0.0)
 (threshold = 24, nr_of_bikes = 4, sr_brak_na_dzien = 0.24, sr_przewoz_na_dzien = 0.0)   …  (threshold = 24, nr_of_bikes = 20, sr_brak_na_dzien = 0.42, sr_przewoz_na_dzien = 0.02)
 (threshold = 25, nr_of_bikes = 4, sr_brak_na_dzien = 0.28, sr_przewoz_na_dzien = 0.0)      (threshold = 25, nr_of_bikes = 20, sr_brak_na_dzien = 0.46, sr_przewoz_na_dzien = 0.0)

to DataFrame?