# Configure Simulation Conditions

Select solver, set initial conditions, pick input data set, set step
size

After you build a model in Simulink^{®}, you can configure the simulation to run quickly and accurately
without making structural changes to the model.

The first step in configuring your simulation is to select a solver. By default, Simulink automatically selects a variable-step solver. You can fine tune the solver options or select a different solver in the Solver Pane of the Configuration Parameters dialog box.

Sometimes, a simulation can slow down or stall. Use the Solver Profiler to identify bottlenecks in the simulation and get recommendations to improve the solver performance.

## Functions

## Tools

## Model Settings

## Topics

### Solvers in Simulink

**Choose a Solver**

Choose a solver based on the dynamics of the model.

**Compare Solvers**

A dynamic system is simulated by computing its states at successive time steps over a specified time span, using information provided by the model.**Zero-Crossing Detection**

Learn how zero-crossing events affect simulation.**Choose a Jacobian Method for an Implicit Solver**

For implicit solvers, Simulink must compute the*solver Jacobian*, which is a submatrix of the Jacobian matrix associated with the continuous representation of a Simulink model.**Use Local Solvers in Referenced Models**

Learn how local solvers work and how to configure a local solver.**Zero-Crossing Detection with Fixed-Step Simulation**

Learn how zero-crossing detection affects fixed-step simulation.

### State Information

**Save Block States and Simulation Operating Points**

Learn how you can use state information logged from simulation and decide how to log states and operating points.**Load State Information**

Import initial states and initialize specific states.**Use Model Operating Point for Faster Simulation Workflow**

Reduce the time required to run a set of simulations by simulating from an initial operating point.

### Solver Profiler

**Examine Model Dynamics Using Solver Profiler**

Identify factors affecting model simulation using the Solver Profiler.**Solver Resets**

The Solver Profiler logs events that cause the solver to reset its parameters because solver resets do incur computational cost.**Zero-Crossing Events**

Detect zero-crossing events using Solver Profiler.**Solver Exception Events**

This example simulates two identical nonlinear spring-damping systems.**Jacobian Logging and Analysis**

The Solver Profiler supports Jacobian logging and analysis for implicit solvers.

### Algebraic Loops

**Algebraic Loop Concepts**

Learn how algebraic loops are created during simulation.**Identify Algebraic Loops in Your Model**

If Simulink reports an algebraic loop in your model, the algebraic loop solver may be able to solve the loop.**Remove Algebraic Loops**

Learn how to break undesired algebraic loops in a model.**Modeling Considerations with Algebraic Loops**

Learn modeling techniques to avoid unnecessary algebraic loops.