Gamma CDF and PDF

Let X ~ gamma (60,0.5) and I want to calculate P(X < 5) for example. How can I use gampdf and gamcdf for calculating this? I calculated this manually and there is a diffrence between the answers so I want to make sure I am typing every thing correctly.

Thanks!

[José-Luis]

Have you tried reading the documentation? What do you mean by manually?

Answer 1

[Wayne King]

The probability that the random variable following that probability law is less than 5 is the integral of the CDF from 0 to 5

    gamcdf(5,60,0.5)

I get exactly the same answer in R by the way with

> pgamma(5,shape=60,scale = 1/2)