The status of balreal, baltrunc and other functions related to model order reduction

[hurak]

I have noticed that there are some functions related to model order reduction in matrix_comps.jl but they are not listed anywhere. Namely balreal() and baltrunc(). I only found them while going through the code. Is there any reason for hiding them (perhaps users are not encouraged to use them right now)? If not, it would be a pitty not to list them. I might even contribute some examples of usage.

[baggepinnen]

Both balreal and baltrunc are exported names, but they might not have ended up in the documentation which they of course should do. They should be perfectly usable, at least last time I checked..

[baggepinnen]

See #212 . They might get included if that PR is merged

[baggepinnen]

This can safely be closed now, they appear in the docs here
https://juliacontrol.github.io/ControlSystems.jl/latest/lib/analysis/#ControlSystems.baltrunc-Tuple{ST}%20where%20ST%3C:AbstractStateSpace
and there are two PRs up making them a whole lot better

• use ME for gram #588
• Fix baltrunc #589