Set Stress Tensor: given either
3-vector, or 6-vector, create the symmetric stress tensor matrix.
Usage
setSTRESS(Stensor)
Arguments
Stensor
stress tensor as a vector or a 3 by 3 matrix,
a 3-vector (principal stresses) or a 6-vector (principal and off
diagonal in row-order.
Value
List: eigen value decomposition
Details
Can be either three components of diagonal,
or six components of the stress tensor.
If the number of elements is neither 3 nor 6, returns NULL
and an error message.