Re: [R] Regularized gamma function/ incomplete gamma function

2009-12-13 Thread Stefan Evert
Indeed, it seems that the author of zipfR has neither been aware that the (scaled / aka regularized) incomplete gamma (and beta, for that matter!) functions have been part of R all along. ... ... well , inspecting his code reveals he did know it. But why then on earth provide all the n

Re: [R] Regularized gamma function/ incomplete gamma function

2009-12-12 Thread Martin Maechler
RV> I would be very grateful if you could help me with: RV> Given the regularized gamma function Reg=int_0^r RV> (x^(k-1)e^(-x))dx/int_0^Inf (x^(k-1)e^(-x))dx ; 0 (which is eventually the ratio of the Incomplete gamma RV> function by the gamma function), and which is exactly what

Re: [R] Regularized gamma function/ incomplete gamma function

2009-12-11 Thread Ravi Varadhan
2009 11:13 AM To: r-help@R-project.org Subject: [R] Regularized gamma function/ incomplete gamma function Dear all, I would be very grateful if you could help me with: Given the regularized gamma function Reg=int_0^r (x^(k-1)e^(-x))dx/int_0^Inf (x^(k-1)e^(-x))dx ; 0https://stat.ethz.ch/mailman/listinfo/r

Re: [R] Regularized gamma function/ incomplete gamma function

2009-12-11 Thread Stefan Evert
I would be very grateful if you could help me with: Given the regularized gamma function Reg=int_0^r (x^(k-1)e^(-x))dx/ int_0^Inf (x^(k-1)e^(-x))dx ; 0of the Incomplete gamma function by the gamma function), does anyone know of a package in R that would evaluate the derivative of the inverse

[R] Regularized gamma function/ incomplete gamma function

2009-12-11 Thread A.Noufaily
Dear all, I would be very grateful if you could help me with: Given the regularized gamma function Reg=int_0^r (x^(k-1)e^(-x))dx/int_0^Inf (x^(k-1)e^(-x))dx ; 0https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide