unify all DIscrete DS (PR #23) from JuliaDynamics/new_discrete

unify all DIscrete DS
amazing changes.
so much wow.

Author: Datseris

CHANGELOG.md

@@ -1,6 +1,14 @@
-# v0.5.2
+# v0.6
+## Massively Breaking
+* Complete overhaul of Discrete Systems: all systems are now one, there is
+  no longer `DDS` and `BigDDS`. Everything is `DDS`!
+* `variational_integrator` renamed to `tangent_integrator`.
+* `DDS` is made up of 2 fundamental parts: a DiscreteProblem and a
+  TangentEvolver.
 ## Non-breaking
-* Massive performance boost of up to 8x in system evolution.
+* Massive performance boost of up to 8x in system evolution of continuous systems.
+* `ParallelEvolver`
+* `TangentEvolver`
 
 # v0.5.0
 

deps/build.jl

@@ -1,24 +1,24 @@
-infomsg = """
-~~~ DynamicalSystemsBase.jl update message ~~~
-
-We have changed the fundamental way users define
-equations of motion and Jacobians
-for all subtypes of `DynamicalSystem`!
-In short, parameters are now directly passed
-into the equations of motion function, e.g.
-`f(du, u, p, t)`. These updates are in-line
-with DifferentialEquations v4.0 release.
-
-Notice that the same changes happened for
-discrete systems as well. For example, the
-e.o.m. for `DiscreteDS` are now expected
-in the form `eom(x, p)`.
-
-Please see the documentation strings of the system types you are using!
-
-Also, be sure to visit the updated documentation here:
-https://juliadynamics.github.io/DynamicalSystems.jl/latest/
-
-"""
-
-info(infomsg)
+# infomsg = """
+# ~~~ DynamicalSystemsBase.jl update message ~~~
+#
+# We have changed the fundamental way users define
+# equations of motion and Jacobians
+# for all subtypes of `DynamicalSystem`!
+# In short, parameters are now directly passed
+# into the equations of motion function, e.g.
+# `f(du, u, p, t)`. These updates are in-line
+# with DifferentialEquations v4.0 release.
+#
+# Notice that the same changes happened for
+# discrete systems as well. For example, the
+# e.o.m. for `DDS` are now expected
+# in the form `eom(x, p)`.
+#
+# Please see the documentation strings of the system types you are using!
+#
+# Also, be sure to visit the updated documentation here:
+# https://juliadynamics.github.io/DynamicalSystems.jl/latest/
+#
+# """
+#
+# info(infomsg)

src/DynamicalSystemsBase.jl

@@ -6,10 +6,6 @@ in in the ecosystem of DynamicalSystems.jl
 """
 module DynamicalSystemsBase
 
-abstract type DynamicalSystem end
-
-export DynamicalSystem, Systems
-
 include("dataset.jl")
 include("reconstruction.jl")
 include("various.jl")
@@ -18,4 +14,6 @@ include("discrete.jl")
 include("continuous.jl")
 include("famous_systems.jl")
 
+export Systems
+
 end

src/continuous.jl

@@ -2,7 +2,7 @@ using OrdinaryDiffEq, Requires, ForwardDiff
 import OrdinaryDiffEq.ODEProblem
 import OrdinaryDiffEq.ODEIntegrator
 
-export ContinuousDS, variational_integrator, ODEIntegrator, ODEProblem
+export ContinuousDS, tangent_integrator, ODEIntegrator, ODEProblem
 export ContinuousDynamicalSystem, DEFAULT_DIFFEQ_KWARGS, get_sol
 export parallel_integrator
 
@@ -204,7 +204,7 @@ end
 
 
 """
-    variational_integrator(ds::ContinuousDS, S::Matrix, [, t]; diff_eq_kwargs)
+    tangent_integrator(ds::ContinuousDS, S::Matrix, [, t]; diff_eq_kwargs)
 Return an `ODEIntegrator` that represents the variational equations
 of motion for the system. `t` makes the `tspan` and if it is `Real`
 instead of `Tuple`, initial time is assumed zero.
@@ -219,7 +219,7 @@ deviation vectors.
 The only keyword argument for this funcion is `diff_eq_kwargs` (see
 [`trajectory`](@ref)).
 """
-function variational_integrator(ds::ContinuousDS, S::Matrix, T = ds.prob.tspan;
+function tangent_integrator(ds::ContinuousDS, S::Matrix, T = ds.prob.tspan;
     diff_eq_kwargs = DEFAULT_DIFFEQ_KWARGS)
 
     f! = ds.prob.f