Incomplete Gamma Function

[bshoring]

Namir,
I wonder if you can enlighten me on this program.

I am no expert on Gamma nor a mathematician, but I have run other programs that compute both Gamma and Incomplete Gamma.

I have run this program as well as the one on page 223 of Henrici's book. Using the examples he gives on page 229, I get the same results with both programs IF I use a=0.

I am confused on:
1. What should one use for "a"? (I see a reference to a < 0 on p. 223)

2. Am I correct that the argument you want the result for is x?

3. With other incomplete gamma programs I have run, if I use a=0.5 and x=>35, I get a result close to 1.77245, comparable to an actual gamma function. I guess I am just trying to figure out how to relate the Henrici Incomplete Gamma to others.

Do you think you can shed any light on this for me? I would just like to be able to understand what I am getting.

Thanks,
Bob