YI = 1.6968467
B1 = -0.1915674
C = -1.8162469

def yoshida(i)
  C + YI / (1 + B1 * (i ** (-C)))
end

(1..6).step(0.1).each do |i|
  puts "#{i}:\t\t\t\t#{yoshida(i)}"
end

__END__

1.0:                      0.28268713605940676
1.1:                      0.3810930023893453
1.2:                      0.4979558391475163
1.3:                      0.6376562991943244
1.4:                      0.8062311611168134
1.5:                      1.0122079163082829
1.6:                      1.2680074021911742
1.7000000000000002:       1.5924212709177847
1.8:                      2.0152639964107912
1.9:                      2.58680579151636
2.0:                      3.3989013562651422
2.1:                      4.639137253745597
2.2:                      6.759394636564507
2.3:                      11.194210525907637
2.4000000000000004:       26.213076403643598
2.5:                      -146.06573981039682
2.6:                      -21.44095695040547
2.7:                      -12.1914001973843
2.8:                      -8.799166273171931
2.9000000000000004:       -7.0405180266341185
3.0:                      -5.965654485287382
3.1:                      -5.241490712908672
3.2:                      -4.721016950862125
3.3000000000000003:       -4.329287844016599
3.4000000000000004:       -4.024087548573596
3.5:                      -3.7798231031686242
3.6:                      -3.5800769541646678
3.7:                      -3.413834107941261
3.8000000000000003:       -3.27342938631132
3.9000000000000004:       -3.153364476809449
4.0:                      -3.049593167871239
4.1:                      -2.959071970358705
4.2:                      -2.879467869326739
4.300000000000001:        -2.808962638782594
4.4:                      -2.7461184407407466
4.5:                      -2.6897834291342004
4.6:                      -2.6390241242019097
4.7:                      -2.5930761006904794
4.800000000000001:        -2.5513074543289465
4.9:                      -2.5131913440043157
5.0:                      -2.4782850843684483
5.1000000000000005:       -2.4462140358770537
5.2:                      -2.4166590556254937
5.3:                      -2.389346623678597
5.4:                      -2.3640410024874274
5.5:                      -2.340537957398528
5.6000000000000005:       -2.3186596874521257
5.7:                      -2.298250702940365
5.800000000000001:        -2.2791744497829716
5.9:                      -2.2613105276104344
6.0:                      -2.2445523832887946