Solved: I know this is a bit of a stretch, but is there anyway to encode the Ei(x) funct... - Page 2

surfacethought · Aug 30, 2012 01:37 PM

The Ei(X) function is (I guess) a fairly rare function. At least I've never had to deal with it before. But it has popped up in an analysis I am doing, I am wondering if there is anyway to encode it into a formula in JMP. Clearly, it isn't in there by default, but is there a way to manually enter this:

$\mbox{Ei}(x)=\int_{-\infty}^x\frac{e^t}t\,dt.\,$

Into a formula column? Thanks in advance.

--SurfaceThought

pmroz · Sep 4, 2012 02:03 PM

They're pretty much completely different languages. If I have some free time (hah) I'll take a stab at converting it.

stevedenham · Sep 4, 2012 03:27 PM

I think there is an R package that will do the integration. Would that be easier to implement than re-coding?

Steve Denham

pmroz · Sep 7, 2012 09:05 AM

OK here's a JSL implementation of the Fortran code. The code runs, but you'll need to test it out to make sure the numbers are good. It's pretty much a straight conversion of the Fortran program. Interesting exercise!

surfacethought · Sep 12, 2012 12:36 PM

PMroz,

This is incredible! It works flawlessly! This is certainly beer-worthy work, if you think of a way I can buy you one let me know

--SurfaceThought

I know this is a bit of a stretch, but is there anyway to encode the Ei(x) function in JMP.

Re: I know this is a bit of a stretch, but is there anyway to encode the Ei(x) function in JMP.

Re: I know this is a bit of a stretch, but is there anyway to encode the Ei(x) function in JMP.

Re: I know this is a bit of a stretch, but is there anyway to encode the Ei(x) function in JMP.

Re: I know this is a bit of a stretch, but is there anyway to encode the Ei(x) function in JMP.