Andreas Dutzler

Hi, I've seen that the casADi-internal speed is fantastic, but the conversion to numpy is rather slow, especially for larger matrices. The performance is still good, but probably there is...

According to [the priority of operators](https://software.intel.com/en-us/fortran-compiler-18.0-developer-guide-and-reference-summary-of-operator-precedence) in Fortran it is necessary to use brackets for Tensor operators. For example the power operator `**` which is overridden by the double dot...

Add sqrt(T)

2

Perform a polar decomposition of a positive definite 3x3 matrix to obtain the stretch tensor which satisfies C = U^2

Isotropic Tensor Functions

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Add isotropic tensor functions like sqrt(T), exp(T), etc. [Source](https://www.google.at/url?sa=t&source=web&rct=j&url=https://classes.soe.ucsc.edu/cmps161/Winter14/papers/t4/RelatedWork/ItskovFourthOrder.pdf.pdf&ved=0ahUKEwjcnPfCjunXAhWEC-wKHfifBaAQFgg1MAM&usg=AOvVaw1Kx0_SJxhmPOpsZ9p_85AG) Or Eigenvalue/Eigenvector Calculation with the help of LAPACK

Print of tensor components

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Add an option to print tensor components with a simple function call.

Optionally include open cycles in rainflow cycle counting

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by adding a new function argument `find_rainflow_cycles(reversals, include_open_cycles=False)`. This is a follow-up of #17 for the suggestion _originally posted by @Gunnstein in https://github.com/Gunnstein/fatpack/issues/17#issuecomment-1485143741_. ### Description Move the (duplicated) code-blocks for...

Add unit tests

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ideally within a CI/CD pipeline using Github Actions.

to assemble the volume/mass matrix of a solid body. This could be added as a) mass-matrix to a region as `Region.mass(density=1.0)`? b) or as `IntegralForm`-attribute `Region.mass` which will provide `integrate()`...

these are missing ### Tasks - [ ] `SolidBody.evaluate` and - [x] `FieldContainer.evaluate`, see #728

Not only for quadratic cells, but for all kind of cells. We could use the dual field definition for dual (one order lower) regions to project? This will require some...