update and move stab_unstab to ControlSystems (#111)

* update and move `stab_unstab` to ControlSystems

* revert

Author: baggepinnen

Project.toml

@@ -25,7 +25,7 @@ UnPack = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
 [compat]
 ChainRulesCore = "1"
 ComponentArrays = "0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15"
-ControlSystemsBase = "1.7"
+ControlSystemsBase = "1.12"
 DescriptorSystems = "1.2"
 Distributions = "0.25"
 GenericSchur = "0.5.2"

src/descriptor.jl

@@ -100,7 +100,8 @@ Coprime-factor reduction performs a coprime factorization of the model into \$P(
 
 # Arguments:
 - `factorization`: The function to perform the coprime factorization. A non-normalized factorization may be used by passing `RobustAndOptimalControl.DescriptorSystems.glcf`.
-- `kwargs`: Are passed to `DescriptorSystems.gbalmr`
+- `kwargs`: Are passed to `DescriptorSystems.gbalmr`, the docstring of which is reproduced below:
+$(@doc(DescriptorSystems.gbalmr))
 """
 function baltrunc_coprime(sys, info=nothing; residual=false, n=missing, factorization::F = DescriptorSystems.gnlcf, kwargs...) where F
     if info !== nothing && hasproperty(info, :NM)
@@ -150,15 +151,6 @@ function baltrunc_unstab(sys::LTISystem, info=nothing; residual=false, n=missing
     ss(sysr + unstab), hs, (; stab, unstab)
 end
 
-"""
-    stab, unstab = stab_unstab(sys; kwargs...)
-
-Decompose `sys` into `sys = stab + unstab` where `stab` contains all stable poles and `unstab` contains unstable poles. See $(@doc(DescriptorSystems.gsdec)) for keyword arguments (argument `job` is set to `"stable"` in this function).
-"""
-function stab_unstab(sys; kwargs...)
-    stab, unstab = DescriptorSystems.gsdec(dss(sys); job="stable", kwargs...)
-    ss(stab), ss(unstab)
-end
 
 ##
 

src/named_systems2.jl

@@ -365,7 +365,7 @@ end
 
 Return a system with specified state variables as measurement outputs.
 
-See also [`add_output`](@ref).
+See also [`ControlSystemsBase.add_output`](@ref).
 """
 function measure(s::NamedStateSpace, names)
     inds = names2indices(names, s.x)