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what are you trying to measure with this vector and in what situation? May be I can come up with another way?
I don't really trust what the vectors are showing me so I wanted to validate them by listing the elements and there corresponding vector angle. I'm primarily interested in the principal stress and the angle it makes in reference to a coordinate system. BTW, there is a SPR out for vectors plots, so hopefully there will be some improvement in this area.
There is a no way to measure the angle of the vector directly, but if you take the three stress components (which I assume that you are doing), then you could calculate the angle.