Hope you are doing well, -The version number of GSL: 1.16 and also, 2.4 -Hardware and operating system: Lenovo E531, Windows 10 x64 -The compiler used: Visual studio 2015 enterprise, Release and Debug. -A description of the bug behavior: For some values of P, the inverse beta function fails to converge and return NaN. Here are the inputs and the corresponding results of the beta inverse function in MATLAB. a = 9.15 b = 657.69 P = 0.957 gsl= NaN MATLAB = 0.0223 a = 0.812 b = 337.12 P = 0.658 gsl= NaN MATLAB = 0.0025 a = 1.62 b = 1983.37 P = 0.704 gsl= NaN MATLAB = 0.0010 a = 1.07 b = 242.92 P = 0.884. gsl= NaN MATLAB = 0.0093 Also, this issue appeared in the inverse function of Gamma distribution, So, I think it all goes back to an issue in the Gamma function because it is used for both distributions. Please let me know if you have any suggestions to fix this bug. Many thanks.
Thanks in advance, Mehdi Tahgizadeh
