`tensor.prin.dir`

Syntax

- l := tensor.prin.dir(t)
Get the principal values and directions of a tensor.

- Returns a list that is four entries long.
- The first entry (index 1) is a vector containing the principal values (x=minimum, y=intermediate, z=maximum).
- The second entry (index 2) is a unit vector indicating the direction of of the minimum principal stress.
- The third entry (index 3) is a unit vector indicating the direction of the intermediate principal stress.
- The fourth entry (index 4) is a unit vector indicating the direction of the maximum principal stress.

Returns: l - A list of four entries containing the principal values and directions of the tensor. Arguments: t - The tensor to find the principal values and directions of.

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