Add (static) size() method to MultiTypeBlockMatrix

Since the istl view is, that a matrix is a container of rows,
it should have a size method.

See merge request !58

Since the istl view is, that a matrix is a container of rows,
it should have a size method.

This is in fact an _unsafe_ downcast to a derived
class. Accessing members via this pointer is undefined
if it is not guaranteed that the passed pointer
points to an object of the _derived_ class - even
if the memory layout is the same. In this case
this static_cast acts like a reinterpret_cast.

If the correct average is provided, compress() may still
fail if more than the average numebr of entries are added
to an early row (e.g. the first one)

Fix broken Matrix::transpose()


Due to a confusion between the number of lines N and the number of columns M, `Matrix::transpose()` gave wrong results for matrices with N != M.

This also adds a testcase demonstrating the problem to matrixtest.cc.

See merge request !56

Due to a confusion between the number of lines N and the number of
columns M, Matrix::transpose() gave wrong results for matrices with
N != M.

Due to a bug in Matrix::transpose() it will give wrong results for
non-quadratic matrices. Thus the new test case fails for the moment.

[cleanup] Remove debug output

Remove output that printed the matrix for parallel runs for small grids n<20.

See merge request !54

Remove output that printed the matrix for parallel runs for small grids n<20.

Remove autotools from dune-istl



See merge request !53

Stop finding old SuperLU versions.

Previously CMake pretended to have found a valid
SuperLU version for DUNE even if the version was
too old (i.e. < 4). People having such an old versions
only noticed this via later compile errors of binaries
using SuperLU. That is far too late.

With this patch we introduce a compile check into the
CMake module that fails for old unsupported versions.
In that case CMake will not find SuperLU.

See merge request !52

Previously CMake pretended to have found a valid
SuperLU version for DUNE even if the version was
too old (i.e. < 4). People having such an old versions
only noticed this via later compile errors of binaries
using SuperLU. That is far too late.

With this patch we introduce a compile check into the
CMake module that fails for old unsupported versions.
In that case CMake will not find SuperLU.

[bugfix] fix number of columns for non-scalar matrix blocks



See merge request !44

Remove deprecated constructors

According to git blame the last time these constructors were changed was
in 2011.

See merge request !50

According to git blame the last time these constructors were changed was
in 2011.

Replace a C pointer by a std::unique_ptr

Simplifies the memory management.

See merge request !49

Simplifies the memory management.

[cmake] Apply the CMAKE_GUARD parameter of dune_add_Test to dune-istl

Except for those parts that do still rely on the enable trick to
test a certain feature set.

See merge request !42

Throw error when LDL factorisation fails



See merge request !47

Add .gitlab-ci.yml



See merge request !46

Use hybridutilities

This merge request simplifies the implementation of `MultiTypeBlockVector` and `MultiTypeBlockMatrix` by using hybridutilities.hh.

It is based on dune-common!103

Reimplement this using Hybrid::forEach. Along the way this
also fixes the bug that operator<< ignores the passed stream
and uses std::cout instead.

The new implementation is based on Hybrid::forEach

Test with non-zero matrix and print results

Reimplement this using Hybrid::forEach. This also adds some
comments and uses proper variable names to make the nan-tracking
easier to understand.

Reimplement this using Hybrid::forEach.

Reimplement this using Hybrid::forEach.

Reimplement this using Hybrid::forEach.

These separate impelmentations could be replaced by a single one,
once we have IsNumber. Currently we could use std::is_arithmetic
instead, but that's not the topic of this change.

Reimplement this using Hybrid::forEach.