Quantile function of gamma distribution

I saw some discussions here about quantile function of gamma distribution. I tried implement all the sugestions, but I don’t got sucess.

The last sugestion that I saw and tried was called the function gamm_q_inv() in the boost library of C++, that didn’t work for me. Anyone knows a another practical solution that works.

I appreciate the help.

Could you please be a bit more specific about what did not work for you and what other threads you read?

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