Francesco Rizzi

array_t: overload `operator()` for multi-dim indexing

22

## Description Currently, `array_t` supports direct subscripting via: ```cpp template const T& at(Ix... index) const; template T& mutable_at(Ix... index); ``` both of these *always* check preconditions on the rank (ndim)...

P1673: typo in rank_2k update description

1

@mhoemmen

support mixed fom/rom: default lspg and default implicit galerkin

1

### default lspg implicit - [x] implementation - basic tests - [x] rom-fom-rom (bdf1) - [x] rom-fom-rom (bdf2) - [x] fom-rom-fom (bdf1) - [x] fom-rom-fom (bdf2) - more complex tests...

we currently require: ``` && std::is_convertible< typename T::independent_variable_type, typename ::pressio::Traits::scalar_type >::value ``` and inside we work with scalar_type but i think we should use std::common_t if possible and overall assess...

the guess callback is not being called before the stpper executes a step. this is correct as far as the predicted state, but it is wrong for the history because...

this is not something that we have to do, but we can at least explore how much work this is

we currently have exceptions under the namespace `pressio::eh`. where eh stands for "error handling". We can simplify this by removing the `eh`.

for example, we need to guard against things like: ``` static_cast(-1) ``` when `T == unsigned int`

Failure for `MinMaxLoc` for OpenMPTarget

9

@rgayatri23 @crtrott @dalg24 (FYI @cz4rs) While implementing `minmax_element` for the std algorithms, I had to implement a custom `StdMinMaxLoc` reducer. However, I saw a problem with OpenMPTarget. I thought I...

Some methods seem to be missing in the API: - **sqrt**, **max** and **min** are missing in simd_common. - **cbrt** is missing for vsx and neon - **exp** is missing...