ICLOCS2

http://www.ee.ic.ac.uk/ICLOCS/
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ICLOCS2 is a MATLAB and Simulink software package for solving optimal control problems by...
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### Configure Hot Start

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedOptionAuto.html

Set the initial guess method for the solving process.

```matlab
options.start='...';
```

--------------------------------

### Main script: solve and simulate (main_DoubleIntegratorTracking.m)

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleDITracking.html

Fetches the problem definition, gets options and solver settings, solves the NLP, and simulates the solution using ode113 with a step size of 0.01.

```matlab
[problem,guess]=DoubleIntegratorTracking;          % Fetch the problem definition
options= problem.settings(30);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### Solve and simulate in main_BatchFermentor.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBatchFermentor.html

Main script that fetches the problem definition, gets solver options, solves the NLP, and simulates the solution. The last line performs an open-loop simulation using the ode113 solver with a step size of 0.01, applying the obtained input trajectory to the dynamics defined in BatchFermentor_Dynamics_Sim.m.

```matlab
[problem,guess]=BatchFermentor;          % Fetch the problem definition
options= problem.settings(300);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### Set Adigator path

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedOptionMultiPhase.html

Specifies the installation path of Adigator when options.derivatives='adigator' is selected. The path can be relative (e.g. '../../adigator') or exact (e.g. 'D:\adigator').

```matlab
options.adigatorPath='...';
```

--------------------------------

### main_Bangbang.m: solve and plot

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang.html

Main script main_Bangbang.m: fetches the problem definition, gets options and solver settings, solves the resultant NLP, and generates plots for the solution.

```matlab
[problem,guess]=BangBang;          % Fetch the problem definition
options= problem.settings(30);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
genSolutionPlots(options, solution);
```

--------------------------------

### Set up automatic regularization: problem.data.penalty.values and problem.data.penalty.i

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedProblemSingle.html

Sets up the automatic regularization function. The sequence of weights is defined in problem.data.penalty.values and the starting index in problem.data.penalty.i. The parameter can be called with vdat.penalty.values(vdat.penalty.i) in problem formulation functions.

```matlab
problem.data.penalty.values=[weight_1, weight_2, ... weight_n];
problem.data.penalty.i=1; %starting weight
```

--------------------------------

### Load MPC controllers in ICLOCS_NLPSolver.m

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedCLSim.html

In the controller main function ICLOCS_NLPSolver.m, load different MPC controllers based on a condition. For each controller, set opt_step (re-optimization interval, 0 for ASAP) and opt_t_min (stop re-optimizing if solution.tf is smaller). The example shows controller 2 and the default controller 1.

```matlab
if  ConditionForController2
    opt_step=...; % time interval for re-optimization for controller 2, set to zero for update ASAP
    opt_t_min=0; % stop re-optimizing if solution.tf is smaller than opt_t_min
    [ tfpu ] = ICLOCS_NLPSolver_Phase2(tpx0);
...
else % default controller
    opt_step=0.01; % time interval for re-optimization, set to zero for update ASAP
    opt_t_min=0; % stop re-optimizing if solution.tf is smaller than opt_t_min
    [ tfpu ] = ICLOCS_NLPSolver_Phase1(tpx0);
end
```

--------------------------------

### Configure per-phase discretization options

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedProblemMultiPhase.html

Set the discretization options for each phase, allowing different methods per phase. For example, use the h method with Nps mesh intervals for phase 1 and the hp method with Nps intervals and polynomial order Npd for phase 2.

```matlab
phaseoptions{1}=problem.phases{1}.settings(Nps); % h method for phase 1
phaseoptions{2}=problem.phases{2}.settings(Nps,Npd); % hp method for phase 2
...
```

--------------------------------

### Set options for pseudo-spectral methods with custom meshing

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainSinglePhase.html

Sets solver options for pseudo-spectral methods using two arrays for customized meshing. For example, settings([-1 0.3 0.4 1],[4 5 3]) creates 3 segments on the normalized intervals with specified polynomial orders.

```matlab
options= problem.settings([-1 0.3 0.4 1],[4 5 3]);
```

--------------------------------

### Configure simulation and fetch first problem

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedCLSim.html

In the initialization script, configure the simulation time step, initial mesh points, the settings function handle for the first controller, and fetch the first optimal control problem definition.

```matlab
tstep=0.1; % time step of simulation
N_node=20; % initial number of mesh points
settings_func=@settings_MinTimeClimbBryson_Phase1;  % Function handle for the settings file of the first controller
[problem,guess]=MyProblem_Phase1;          % Fetch the problem definition 
```

--------------------------------

### Define static parameters for multiphase problem in BangBang.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Defines the static parameters as part of the optimization variables. The parameters are set to empty in this example.

```matlab
problem.mp.parameters.pl=[];
problem.mp.parameters.pu=[];
guess.mp.parameters=[];
```

--------------------------------

### Initialize iteration control variables

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainMR.html

Sets initial values for the maximum absolute error, starting iteration, and maximum iteration count (50) for the mesh refinement loop.

```matlab
maxAbsError=1e9; % the initial (before start) maximum absolute local eeror
i=1; % starting iteration
imax=50; % maximum number of mesh refinement iterations
```

--------------------------------

### Execute Main Script main_TwoLinkRobotArm.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleRobotArm.html

Fetches the problem definition, solves the NLP, and simulates the solution.

```matlab
[problem,guess]=TwoLinkRobotArm;          % Fetch the problem definition
options= problem.settings(20);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### Main script main_BangbangTwoPhase.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Fetches the problem definition, applies solver settings, solves the NLP, and generates solution plots.

```matlab
[problem,guess,options.phaseoptions]=BangBangTwoPhase;          % Fetch the problem definition
options.mp= settings_BangbangTwoPhase;                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
genSolutionPlots(options, solution);
```

--------------------------------

### Set initial conditions and bounds in myProblem.m

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedProblemSingle.html

Provide the initial conditions and their bounds. To fix an initial state, set the upper and lower bounds equal; to leave it free or bounded, set different bounds and use problem.states.x0=[].

```matlab
problem.states.x0=[x1(t0) ... xn(t0)];

```

```matlab
problem.states.x0l=[x1(t0)_lowerbound ... xn(t0)_lowerbound]; 
problem.states.x0u=[x1(t0)_upperbound ... xn(t0)_upperbound];  

```

--------------------------------

### Solve the problem and simulate solution in main_OrbitRaising.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleOrbitRaising.html

Fetches the problem definition, sets options, solves the NLP, and simulates the solution using ode113 with a step size of 0.01. Note that the simulation uses the dynamics defined in WindshearGoAround_Dynamics_Sim.m.

```matlab
[problem,guess]=WindshearGoAround;          % Fetch the problem definition
% options= problem.settings(5,8);                  % for hp method
options= problem.settings(20);                  % for h method
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### Set resCostWeight for penalty barrier method

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedOptionSingle.html

For the penalty barrier method, provide a sequence of weights used for regularization. The example suggests a sequence like 1./(2*[1 0.1 0.01 0.001]).

```matlab
options.resCostWeight='...';
```

--------------------------------

### Define system dynamics in BatchFermentor_Dynamics_Internal.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBatchFermentor.html

Defines the system dynamics for the batch fermentor example. The function returns the state derivative vector dx, which is used by the solver to evaluate the differential equations. No path constraints are present, so only dx is returned.

```matlab
x1 = x(:,1);x2 = x(:,2);x3 = x(:,3);x4 = x(:,4);
u1 = u(:,1);

h1 = 0.11*(x3./(0.006*x1+x3));
h2 = 0.0055*(x3./(0.0001+x3.*(1+10*x3)));

dx(:,1) = (h1.*x1-u1.*(x1./500./x4));
dx(:,2) = (h2.*x1-0.01*x2-u1.*(x2./500./x4));
dx(:,3) = (-h1.*x1/0.47-h2.*x1/1.2-x1.*(0.029*x3./(0.0001+x3))+u1./x4.*(1-x3/500));
dx(:,4) = u1/500;
```

--------------------------------

### Initialize and fetch problem with options

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainMR.html

Initializes the workspace, fetches the problem definition, and selects solver options. The active line uses settings_hp with a segment vector and breakpoints; commented alternatives show settings_auto and settings_h.

```matlab
clear all;close all;format compact;

global sol;  
sol=[];                             % Initialize solution structure

[problem,guess]=myProblem;  		% Fetch the problem definition

%%%% Choice among the ones belwo %%%%
% options= settings_auto(40);                  
% options= settings_h(40);                
% options= settings_hp(5,4);                 
options= settings_hp([4 5 3],[-1 0.3 0.4 1]);    % Get options and solver settings 

```

--------------------------------

### Execute main_CarParking.m solver script

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleParallelParking.html

Fetches the problem definition, configures solver settings, solves the NLP, and performs an open-loop simulation using the ode113 solver.

```matlab
[problem,guess]=CarParking;          % Fetch the problem definition
options= problem.settings(200);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01,[5;2]);
```

--------------------------------

### Solve commercial flight profile problem

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleCommericalFlight.html

Main script that fetches the problem definition, gets solver options with 60 collocation points, solves the NLP, and returns the solution and iteration history. The comment lines indicate the purpose of each call.

```MATLAB
[problem,guess]=CommericalFlightProfile;          % Fetch the problem definition
options= problem.settings(60);                  % Get options and solver settings 
[solution,MRHistory]=solveMyProblem( problem,guess,options);
```

--------------------------------

### Main Execution Script

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleMinFuelClimb.html

Fetches the problem, solves the NLP, and simulates the resulting trajectory.

```matlab
[problem,guess]=MinEnergyClimbBryson;          % Fetch the problem definition
% options= problem.settings(10,4);              % for hp method
options= problem.settings(20);                  % for h method
[solution,MRHistory]=solveMyProblem( problem,guess,options);
[ tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### Set options for pseudo-spectral methods with scalar inputs

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainSinglePhase.html

Sets solver options for pseudo-spectral methods using scalar numbers for Nps equally spaced intervals with polynomial orders of Npd. For example, settings(5,4) means 5 LGR intervals each of polynomial degree 4.

```matlab
options= problem.settings(Nps,Npd);
```

--------------------------------

### Load problem and guess from myProblem.m

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainSinglePhase.html

Loads the formulated optimal control problem and initial guess from the user-defined myProblem.m file. This is the first step before setting options and solving.

```matlab
[problem,guess]=myProblem;
```

--------------------------------

### Define function handles in myProblem.m

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedProblemSingle.html

Set up the problem definition file by providing function handles for the internal dynamics, simulation dynamics, optional analytic derivatives, and the settings file. The handles for analytic derivatives are optional; the settings handle is required.

```matlab
InternalDynamics=@myProblem_Dynamics_Internal;
SimDynamics=@myProblem_Dynamics_Sim;

```

```matlab
problem.analyticDeriv.gradCost=@gradCost;
problem.analyticDeriv.hessianLagrangian=@hessianLagrangian;
problem.analyticDeriv.jacConst=@jacConst;

```

```matlab
problem.settings=@settings_myProblem;

```

--------------------------------

### Load solver settings for the multi-phase problem

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainMultiPhase.html

Loads the corresponding solver settings from settings_myMultiPhaseProblem into options.mp.

```matlab
options.mp= settings_myMultiPhaseProblem;
```

--------------------------------

### Define Boundary Conditions and Simple Bounds

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleMinFuelClimb.html

Sets the initial and final values for altitude, speed, flight path angle, and mass, along with their respective physical constraints.

```matlab
% Boundary Conditions 
alt0 = 0; 
altf = 19994.88; 
speed0 = 129.314; 
speedf = 295.092; 
fpa0 = 0; 
fpaf = 0; 
mass0 = 19050.864;

% Simple Bounds
altmin = 0; altmax = 21031.2;
speedmin = 5; speedmax = 1000;
fpamin = -40*pi/180; fpamax = 40*pi/180;
massmin = 22; massmax = 20410;
alphamin = -pi/4; alphamax = pi/4;
```

--------------------------------

### Configure Problem Definition in WindshearGoAround.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleWindshear.html

Sets up function handles for dynamics, specifies derivative settings, and links the settings file.

```matlab
InternalDynamics=@WindshearGoAround_Dynamics_Internal;
SimDynamics=@WindshearGoAround_Dynamics_Sim;
```

```matlab
problem.analyticDeriv.gradCost=[];
problem.analyticDeriv.hessianLagrangian=[];
problem.analyticDeriv.jacConst=[];
```

```matlab
problem.settings=@settings_WindshearGoAround;
```

--------------------------------

### Time variable configuration for BangBangTwoPhase_Phase1.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Configures initial and final time bounds and guesses for the first phase of the two-phase problem.

```matlab
% Initial time.
problem.time.t0_idx=1;
problem.time.t0_min=problem_mp.time.t_min(problem.time.t0_idx);
problem.time.t0_max=problem_mp.time.t_max(problem.time.t0_idx);
guess.t0=guess_mp.time(problem.time.t0_idx);

% Final time. Let tf_min=tf_max if tf is fixed.
problem.time.tf_idx=2;
problem.time.tf_min=problem_mp.time.t_min(problem.time.tf_idx);     
problem.time.tf_max=problem_mp.time.t_max(problem.time.tf_idx); 
guess.tf=guess_mp.time(problem.time.tf_idx);
```

--------------------------------

### main_Hypersensitive.m - Solve and Simulate

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleHypersensitive.html

Fetches problem, solves NLP, and simulates solution using ode113 with step size 0.01.

```matlab
[problem,guess]=Hypersensitive;          % Fetch the problem definition
options= problem.settings(1,8);                  % for hp method
% options= problem.settings(40);                  % for h method
[solution,MRHistory]=solveMyProblem( problem,guess,options);
tv, xv, uv ] = simulateSolution( problem, solution, 'ode113', 0.01 );
```

--------------------------------

### BangBang.m: initial state bounds

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang.html

Sets the lower and upper bounds on the initial state conditions in BangBang.m.

```matlab
problem.states.x0l=[0 0]; 
problem.states.x0u=[0 0]; 
```

--------------------------------

### Add MPC controller folders to path

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedCLSim.html

In the initialization script (e.g., initSim.m), add the MPC controller folders to the MATLAB path so their files can be found.

```matlab
addpath('MPCController1');
addpath('MPCController2');
...
```

--------------------------------

### Store Problem Parameters

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleMinFuelClimb.html

Initializes the problem data structure with physical constants and lookup table data.

```matlab
problem.data.CDdat = CDdat;
problem.data.Clalphadat = Clalphadat;
problem.data.etadat = etadat;
problem.data.M = MachLT;
problem.data.M2 = MachLTAero;
problem.data.alt = AltLT;
problem.data.T = ThrustLT;
problem.data.Re = 6378145;
problem.data.mu = 3.986e14;
problem.data.S = 49.2386;
problem.data.g0 = 9.80665;
problem.data.Isp = 1600;
problem.data.H = 7254.24;
problem.data.rho0 = 1.225;
problem.data.Atomsrho = Atomsrho;
problem.data.Atomssos = Atomssos;
[aa,mm] = meshgrid(AltLT,MachLT);
problem.data.aa = aa;
problem.data.mm = mm;
```

--------------------------------

### Open-loop simulation with default ODE solver

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMainSinglePhase.html

Performs open-loop simulation of the obtained solution using the default ODE solver. Returns time, state, and input variables.

```matlab
[ tv, xv, uv ] = simulateSolution( problem, solution);
```

--------------------------------

### Store and declare variables in WindshearGoAround.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleWindshear.html

Initializes auxiliary data structures, sets initial conditions for flight parameters, and defines variable bounds for the simulation.

```matlab
% Store relevant data
auxdata.a=a;
auxdata.b=b_var;
auxdata.c=c;
auxdata.e=e;
auxdata.d=d;
auxdata.beta_0=beta_0;
auxdata.beta_0_dot=beta_0_dot;
auxdata.A_0=A_0;
auxdata.A_1=A_1;
auxdata.A_2=A_2;
auxdata.B_0=B_0;
auxdata.B_1=B_1;
auxdata.B_2=B_2;
auxdata.C_0=C_0;
auxdata.C_1=C_1;
auxdata.C_2=C_2;
auxdata.g=g_var;
auxdata.m=mg/g_var;
auxdata.delta=delta;
auxdata.rho=rho;
auxdata.S=S;
auxdata.alpha_star=alpha_star;
auxdata.alpha_max=alpha_max;

auxdata.W1_poly=W1_poly;
auxdata.W2_poly=W2_poly;
auxdata.W1_dot_poly=W1_dot_poly;
auxdata.W2_dot_poly=W2_dot_poly;
auxdata.beta_poly=beta_poly;
auxdata.C_L_poly=C_L_poly;

% initial conditions
pos0 = 0;
alt0 = 600; % Initial altitude (ft)
speed0 = 239.7; % Initial speed (ft/s)
fpa0 = -0.03925; % Initial flight path angle (rad)
fpaf = 0.12969; % Final flight path angle (rad)
alpha0 = 0.1283; % Initial angle of attack (rad)

% variable bounds
posmin = 0; posmax = 1e04;
altmin = 1e02; altmax = 1000;
speedmin = 0; speedmax = inf;
fpamin = -inf; fpamax = inf;
alphamin = -alpha_max; alphamax = alpha_max;
umin = -0.05236; umax = 0.05236;
```

--------------------------------

### Single solve workflow with main.m

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedMain.html

Standard workflow for a single solve: load the problem, set solver options (fixed-order h or hp methods), transcribe and solve the NLP, then construct the solution and generate plots. The output command's last argument selects which figures to produce (1: all, 2: state/input, 3: multipliers, 4: errors).

```matlab
[problem,guess]=myProblem;
```

```matlab
options= settings_h(...);
```

```matlab
options= settings_hp(...,...);
```

```matlab
[infoNLP,data,options]=transcribeOCP(problem,guess,options);
[solution,status,data] = solveNLP(infoNLP,data); 
```

```matlab
[solution]=output(problem,solution,options,data,...);
```

--------------------------------

### Time variable configuration for BangBangTwoPhase_Phase2.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Configures initial and final time bounds and guesses for the second phase of the two-phase problem.

```matlab
% Initial time.
problem.time.t0_idx=2;
problem.time.t0_min=problem_mp.time.t_min(problem.time.t0_idx);
problem.time.t0_max=problem_mp.time.t_max(problem.time.t0_idx);
guess.t0=guess_mp.time(problem.time.t0_idx);

% Final time. Let tf_min=tf_max if tf is fixed.
problem.time.tf_idx=3;
problem.time.tf_min=problem_mp.time.t_min(problem.time.tf_idx);     
problem.time.tf_max=problem_mp.time.t_max(problem.time.tf_idx); 
guess.tf=guess_mp.time(problem.time.tf_idx);
```

--------------------------------

### Set initial state conditions

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleOrbitRaising.html

Provides the initial state vector x0 for the problem.

```matlab
problem.states.x0=[1 0 0 1]; 
```

--------------------------------

### Enable flexible mesh with options.adaptseg

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedOptionhp.html

Enables the flexible mesh method, which automatically adjusts interval placement during optimization to accommodate discontinuities like bang-bang inputs.

```matlab
options.adaptseg=1;
```

--------------------------------

### BangBang.m: initial state conditions

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang.html

Sets the initial conditions for the state variables in BangBang.m.

```matlab
problem.states.x0=[0 0];
```

--------------------------------

### Define Boundary Conditions in CarParking.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleParallelParking.html

Initializes state variables and defines limits for position, velocity, acceleration, and steering angle.

```matlab
% Boundary Conditions 
posx0 = -5.14;
posy0 = 1.41;
theta0=deg2rad(6);
v0=0; % Initial velocity (m/s)
a0=0; % Initial accelration (m/s^2)
phi0 = deg2rad(0); % Initial steering angle (rad)

% Limits on Variables
xmin = -10; xmax = 5;
ymin = -SW; ymax = CL;
vmin = -v_max; vmax = v_max;
amin = -a_max; amax = a_max;
thetamin = -inf; thetamax = inf;
phimin = -phi_max; phimax = phi_max;
```

--------------------------------

### State variable configuration for BangBangTwoPhase_Phase2.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Defines initial conditions, state bounds, terminal state bounds, and trajectory guesses for the second phase.

```matlab
% Initial conditions for system.
problem.states.x0l=[0 -200]; 
problem.states.x0u=[300 200]; 

% State bounds
problem.states.xl=[0 -200];
problem.states.xu=[310 200];

% Terminal state bounds. 
problem.states.xfl=[0 0]; 
problem.states.xfu=[0 0];

% Guess the state trajectories with [x0 xf]
guess.states(:,1)=[100 0];
guess.states(:,2)=[-50 0];
```

--------------------------------

### Configure Problem Handles in CarParking.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleParallelParking.html

Sets the function handles for internal and simulation dynamics, configures derivative settings, and links the settings file.

```MATLAB
InternalDynamics=@CarParking_Dynamics_Internal;
SimDynamics=@CarParking_Dynamics_Sim;
```

```MATLAB
problem.analyticDeriv.gradCost=[];
problem.analyticDeriv.hessianLagrangian=[];
problem.analyticDeriv.jacConst=[];
```

```MATLAB
problem.settings=@settings_CarParking;
```

--------------------------------

### Data storage configuration for BangBangTwoPhase_Phase1.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Assigns data storage parameters for the first phase.

```matlab
problem.data=problem_mp.data;
```

--------------------------------

### Specify Phase Settings

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleGoddardRocket2.html

Configures the three distinct phases of the optimal control problem and their respective settings.

```matlab
[problem.phases{1},guess.phases{1}] = GoddardRocket_Phase1(problem.mp, guess.mp);
[problem.phases{2},guess.phases{2}] = GoddardRocket_Phase2(problem.mp, guess.mp);
[problem.phases{3},guess.phases{3}] = GoddardRocket_Phase3(problem.mp, guess.mp);
phaseoptions{1}=settings_GoddardRocketThreePhase_Phase1(10);
phaseoptions{2}=settings_GoddardRocketThreePhase_Phase2(10);
phaseoptions{3}=settings_GoddardRocketThreePhase_Phase3(10);
```

--------------------------------

### Define State Variables

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleParallelParking.html

Configures initial conditions, state bounds, rate bounds, error tolerances, and terminal state bounds for the parking problem.

```matlab
problem.states.x0=[posx0 posy0 v0 theta0 phi0];
```

```matlab
problem.states.x0l=[posx0 posy0 v0 theta0 phi0];
problem.states.x0u=[posx0 posy0 v0 theta0 phi0];
```

```matlab
problem.states.xl=[xmin ymin vmin thetamin phimin]; 
problem.states.xu=[xmax ymax vmax thetamax phimax];
```

```matlab
problem.states.xrl=[-inf -inf -inf -inf -inf]; 
problem.states.xru=[inf inf inf inf inf];
```

```matlab
problem.states.xErrorTol_local=[0.1 0.1 0.1 deg2rad(0.5) deg2rad(0.5)];
problem.states.xErrorTol_integral=[0.1 0.1 0.1 deg2rad(0.5) deg2rad(0.5)];
```

```matlab
problem.states.xConstraintTol=[0.1 0.1 0.1 deg2rad(0.5) deg2rad(0.5)];
problem.states.xrConstraintTol=[0.1 0.1 0.1 deg2rad(0.5) deg2rad(0.5)];
```

```matlab
problem.states.xfl=[l_rear ymin 0 theta0-deg2rad(5) -deg2rad(1)]; 
problem.states.xfu=[SL ymax 0 theta0+deg2rad(5) deg2rad(1)];
```

```matlab
guess.time=[0 guess.tf/3 guess.tf*2/3 guess.tf];
guess.states(:,1)=[posx0 SL+l_rear l_rear SL-l_axes-l_front];
guess.states(:,2)=[posy0 posy0 -SW/2 -SW/2];
guess.states(:,3)=[v0 0 0 0];
guess.states(:,4)=[theta0 theta0 theta0 0];
guess.states(:,5)=[phi0 0 0 0];
```

--------------------------------

### Configure mintimeinterval option

Source: http://www.ee.ic.ac.uk/ICLOCS/GetStartedOptionAuto.html

Defines the minimum mesh interval size in actual time allowed for the mesh refinement process.

```text
options.mintimeinterval=...; 
```

--------------------------------

### BangBang.m: initial state trajectory guess

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang.html

Provides an initial guess for the state trajectory (optional but recommended) in BangBang.m.

```matlab
guess.states(:,1)=[0 300];
guess.states(:,2)=[0 0]; 
```

--------------------------------

### Input variable configuration for BangBangTwoPhase_Phase2.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleBangBang2.html

Defines input bounds and control action guesses for the second phase.

```matlab
% Input bounds
problem.inputs.ul=[-1];
problem.inputs.uu=[2];

% Bounds on first control action
problem.inputs.u0l=[-1];
problem.inputs.u0u=[2]; 

% Guess the input sequences with [u0 uf]
guess.inputs(:,1)=[-1 2];
```

--------------------------------

### Solve Goddard Rocket Three-Phase Problem in main_GoddardRocketThreePhase.m

Source: http://www.ee.ic.ac.uk/ICLOCS/ExampleGoddardRocket2.html

This script fetches the problem definition and solver settings before executing the NLP solver.

```matlab
options.mp= settings_GoddardRocketThreePhase;                  % Get options and solver settings 
[problem,guess,options.phaseoptions]=GoddardRocketThreePhase;          % Fetch the problem definition
[solution,MRHistory]=solveMyProblem( problem,guess,options);
```
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