gammaqInv and gammaqInva: Inverses of normalized gammaq function
gammaqInv(a, q)
gammaqInva(x, q)| a | The numeric 'a' parameter in the upper incomplete gamma |
|---|---|
| q | The numeric 'q' parameter in the upper incomplete gamma |
| x | The numeric 'x' parameter in the upper incomplete gamma |
inverse gammaq results
With the equation:
q = gammaq(a, x)
The 'gammaqInv' function returns a value 'x' that satisfies the equation above
The 'gammaqInva' function returns a value 'a' that satisfies the equation above
NOTE: gammaqInva is slow
Matthew L. Fidler
gammaqInv(1:3, 0.5)
#> [1] 0.6931472 1.6783470 2.6740603
gammaqInv(1, 1:3 / 3)
#> [1] 1.0986123 0.4054651 0.0000000
gammaqInv(1:3, 1:3 / 3.1)
#> [1] 1.131402 1.248533 0.684289
gammaqInva(1:3, 1:3 / 3.1)
#> [1] 1.131402 1.248533 0.684289