It says type mismatch in line 14. How do I fix it?

delete ''then'' or add something to it

Which "THEN"{

the ''then'' code in line:14

If I'm not mistaken, remove the "COMMON " from line 11.

the then has an endif so its not the problem

also common isn't it either I don't think.. would it not be IF STARX%[I]<0 not <=0 or is that just me..?

I think the RNDX function is making something weird. Have you tested that function alone?

So I thought I might try building up my own thing that closely resembles your setup, testing the limits of some of the functions, thinking that I'd stumble across an answer, but I never encountered a problem. So then I tried just copying what you have word for word, and I still don't get a problem. No type mismatch. No error.

The only thing worth mentioning is that I assume you have word wrap turned off, so I assumed that line 8 ends as (400-STARX%[I]).

Here's the cleaned up code. I've tried it in a nearly empty program witn only the code required to use the function. It still says "type mismatch".

Well, i tried the code and runs without issue. I suspect you're using for what should not be used to.

I'm trying to use it as a start to an external library so I can just call the function in future programs.

I mean the way you call it. On the original you parsed a parameter on the function and maybe you're doing it wrong in that sense. I can't really tell.