Cannot change range variable to vector in Mathcad 15

[regcurry]

This works just fine in a fresh worksheet; however, in my more complex Ballistics worksheet, I get the following error.

 Both worksheets are attached.

Even if I close and reopen the ballistics worksheet, the problem persists.😫

Thanks for any help.

Reg

[regcurry]

If I just move it up to here it works.  😩

 

[Werner_E · Accepted solution]

You cleverly tricked yourself  😄

Underneath the evaluation of "Drop" there is a region which says ORIGIN:=1.

So the index 0 is invalid from that point on.

Delete this region and all will be OK again.

[regcurry]

How did you find that?  By a select all?  I never thank to do that.🧐😵‍💫

Thanks much.  I really appreciate the help.🙏🏼

Reg

[Werner_E]

---

@regcurry wrote:

How did you find that?

---

Even before opening your worksheet my best guess was that you inadvertently had set ORIGIN to 1 in your worksheet.

But when I opened it I saw that ORIGIN was set to 0 (at least in Tools-Worksheet Options).

So I typed ORIGIN= to be sure and it showed correctly 0. I moved that region to the end of the worksheet and suddenly it showed 1. So I knew that somewhere in the worksheet you must have written ORIGIN:=1. My first guess was that it would be to the far right, off the screen. But by moving around my "ORIGIN=" region I quickly could locate the offending position. Fencing all regions in that area (as seen in the screenshot which I posted) quickly showed the position of that hidden region.

In the past I tricked myself in a similar way. It wasn't ORIGIN but a normal variable which happened to "mysteriously" change its value in the midst of the worksheet 😉

[regcurry]

Thanks again.