This variable is undefined error-Mathcad Prime 10.0.0.0

[NK_13742597]

Hello, I'm still new to mathcad and I'm trying to understand why this error occurs. Because my z is defined but don't seems to work in my integer. Could somebody explain it to me ?

[terryhendicott]

Please upload the worksheet?  Drag and drop or use the browse button below the input area.

Cheers

Terry

[Werner_E]

1) The error you experience stems from the fact that you are defining a function f.coring and try to numerically evaluate it in the same region (the "=" at the end).

You cannot numerically evaluate the definition of a function. The same goes for your definition of function RR.
Here a simple example:

2) You defined z as being a range. The inline evaluation in the definition (the "=" at the end which displays the range) has no effect. In versions of Prime prior to 10 doing an inline evaluation turned the range into a vector of values. This is not the case in Prime 10 and above. 

So R.coring(z)=... or even RR(z)=... may show numeric results, what you see is actually an invalid data type - its not a range and not a vector either. You cannot assign these 'results' to a variable like Rmin:=RR(z) and you cannot access individual values (because you have not created a vector).

Solution is to create z as a vector or turn the range z into a vector and then call your functions vectorized. That way the results are vectors, too, and can be handled as such.

Here is a simple function which turns a range into a vector

Use it like z:=range2vec(z).

Its only starting with Prime 11 that Prime offers a function "vec" which does this job and also can be used to create a vector right away without having to create a range.

And, yes, for future question please always attach your worksheet, not just a picture.

[Catalina]

Hi @NK_13742597,

I wanted to see if you got the help you needed.

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Of course, if you have more to share on your issue, please pursue the conversation.

Thanks,