Question #685643 on Yade changed:
https://answers.launchpad.net/yade/+question/685643
Status: Open => Answered
Jan Stránský proposed the following answer:
Hi Chanaka,
it all depends on how you define sign for a 3d vector (as you noticed, it is
somehow artificial).
One way is to dot-product the vector with a unit "plus minus vector", e.g. a
unit x vector (1,0,0)
delta_us_scalar = delta_us.dot(plusMinusUnitVector) # python, it would
be similar in C++
cheers
Jan
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