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Whenever in any calculation a NaN is involved, the result is NaN.
Maybe a utility function to do the vector multiplication ignoring any multiplications with NaN involved could help:
Applied to your calculation it looks like this:
Is this somewh...
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Would someone please tell me why when I enter unit for the vectors, it doesn't like it? I watched this video Assigning Units to Vectors and Matrices in Mathcad Prime (youtube.com) and that's what I'm doing. Thanks,

I'm really in need of someone's help in completing the discussion task. I carried it out perfectly at work and had no issues, I thought I'd try it again to confirm my knowledge and now Creo is acting COMPLETELY differently and it's driving me crazy, ...
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