Product Documentation

Search MATLAB Documentation
R2012a Documentation → Simulink
View documentation for other releases	Learn more about Simulink

Contents

Index

• Getting Started

Tool for Model-Based Design

Tool for Simulation

Tool for Analysis

Interaction with MATLAB Environment

What Is Model-Based Design?

Model-Based Design Process

Simulink Online Help

Simulink Demo Models

Web Site Resources

Opening the Simulink Library Browser

Creating a New Simulink Model

Opening an Existing Model

Simulink Library Browser

Simulink Editor Window

Creating a New Model

Adding Blocks to a Model

Moving Blocks in the Model

Block Connections in a Model

Drawing Lines Between Blocks

Drawing a Branch Line

Setting Simulation Options

Running a Simulation and Observing Results

Overview of the Demo Model

Opening the Demo Model

Anatomy of the Demo Model

Subsystems in the Demo Model

Subsystems and Masks

Creating a Subsystem

Creating a Subsystem Mask

Running the Simulation

Changing the Thermostat Setting

Changing the Average Outdoor Temperature

Changing the Daily Temperature Variation

Importing Data from the MATLAB Workspace

Exporting Simulation Data to the MATLAB Workspace

Data Import and Logging Workflow

Example Description

Preparing Signal Builder Block

Importing Data from Excel Spreadsheets

Displaying Input Data

Configuring the Model to Log Output Signals

Running the Simulation

Creating a Figure from a Plot

Saving and Printing a Figure

• User's Guide

• Modeling Guidelines

• Commonly Used

• Discontinuities

Discrete Derivative

Discrete Filter

Discrete FIR Filter

Discrete State-Space

Discrete Transfer Fcn

Discrete Zero-Pole

Discrete-Time Integrator

First-Order Hold

PID Controller (2 DOF)

Transfer Fcn First Order

Transfer Fcn Lead or Lag

Transfer Fcn Real Zero

Zero-Order Hold

• Logic and Bit Operations

• Lookup Tables

• Math Operations

• Model Verification

• Model-Wide Utilities

• Ports & Subsystems

• Signal Attributes

• Signal Routing

• User-Defined Functions

• Additional Math & Discrete

• Run on Hardware Targets

• Release Notes

First-Order Hold - Implement first-order sample-and-hold

Library

Discrete

Description

The First-Order Hold block implements a first-order sample-and-hold that operates at the specified sampling interval. This block has little value in practical applications and is included primarily for academic purposes.

This figure compares the output from a Sine Wave block and a First-Order Hold block.

Data Type Support

The First-Order Hold block accepts and outputs signals of type double. For more information, see Data Types Supported by Simulink in the Simulink documentation.

Parameters and Dialog Box

Sample time: The time interval between samples. See How to Specify the Sample Time in the online documentation for more information.

Characteristics

Direct Feedthrough	No
Sample Time	Specified in the Sample time parameter
Scalar Expansion	No
States	1 continuous and 1 discrete per input element
Dimensionalized	Yes
Zero Crossing	No

See Also

Zero-Order Hold

Related Products & Applications

Get Simulink trial software

Learn more about Simulink through this collection of videos, articles, technical literature and the Getting Started with Simulink Guide.

Get this Simulink Kit

© 1984-2012- The MathWorks, Inc. - Site Help - Patents - Trademarks - Privacy Policy - Preventing Piracy - RSS