The variable is undefined. Check that the label is set correctly. Mathcad 9.0.0.0

[AP_12141614]

Does anyone know why this is happening? I set all the "B" Labels to "Variable" and it still says undefined.

I got this example from a youtube video and it gives a different error.

This is pretty frustrating, not gonna lie. I am new to mathcad, so maybe it's something I'm doing.

Here's to hoping you can help.

Thanks

[StuartBruff · Accepted solution]

Your first problem is caused by evaluation operator after the function definition.  Get rid of it and your troubles go away.

I have no idea why your second problem occurs.  It works fine in Mathcad Prime 10.0 and I see no reason to suppose that it does not work in Mathcad Prime 9.  This is why experienced Mathcadders recommend that you post a worksheet with the problem in it.  There are some subtleties, such as Math Styles or Greek vs Latin characters, that don't necessarily show up very well in a screenshot.   

Ah, in fact, looking closely at your screenshot, did you use the subscript operator ctrl-minus or the index operator [ to insert the i?  A subscript in a name is just a decoration and the i forms part of the name.  An index i is a separate name.

I'd post a worksheet but it wouldn't be much use to you as Mathcad Prime files aren't backward compatible.

Stuart

[AP_12141614]

Ok, now when I call it separately, it works! I mean I guess it was working the whole time, I was just doing it wrong. Thank you so much!

Yeah I used the ctrl- to insert it. When I use the left square bracket [, it works now. Thanks!

[StuartBruff]

No problem.  It's quite common to use one when the other was intended.  I've learned to spot the slight difference in how low an index is compared toa name subscript.

Stuart