MinMax Running Resettable

Determine minimum or maximum of signal over time

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Libraries:
Simulink / Math Operations

Description

The MinMax Running Resettable block outputs the minimum or maximum of all past inputs u. You specify whether the block outputs the running minimum or maximum with the Function parameter.

The block can reset its state based on an external reset signal R. When the reset signal R is nonzero (true), the block resets the output to the value of the Initial condition parameter.

The input can be a scalar, vector, or matrix signal. The block outputs a signal having the same dimensions as the input. Each output element equals the running minimum or maximum of the corresponding input elements.

Examples

Calculate the Running Minimum Value with the MinMax Running Resettable Block

This example shows how to use the MinMax Running Resettable block to calculate the running minimum value. To watch how the running minimum value changes at each time step, you can use the Step Forward button to advance the simulation one step at a time.

After running the full simulation, you can view the results in the Scope. The initial value of the running minimum is 0. It begins tracking the Sine Wave signal when the sine wave values turn negative. When the MinMax Running Resettable block receives a reset signal at T=8, the block resets the running minimum value to 0. The running minimum value tracks at 0 for a few time steps, until the sine wave values turn negative again.

Ports

Input

u — Input signal

scalar | vector | matrix

Input signal as a scalar, vector, or matrix. Based on what you specify for the Function parameter, the block outputs the minimum or maximum value of all past inputs u.

If you specify a scalar value for the Initial condition parameter, the block expands the parameter to have the same dimensions as nonscalar input u.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | bus

R — Reset signal

scalar | vector | matrix

The input port accepting the reset signal as a scalar, vector, or matrix. When the reset signal is nonscalar, it must have the same dimensions as input signal u. As long as the reset signal has a value of zero, the block outputs the running minimum or maximum value of input u. Whenever the reset signal has a nonzero value (true), the block resets the output to the value of the Initial condition parameter.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | bus

Output

y — Running minimum or maximum value

scalar | vector | matrix

Output signal, specified as a scalar, vector, or matrix, where each output element equals the running minimum or maximum value of the corresponding input elements. Output signal y has the same data type and dimensions as input signal u.

When the block receives a nonzero (true) reset signal, the block resets the output to the value of the Initial condition parameter.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point

Parameters

Function — Specify minimum or maximum

min (default) | max

Specify whether the block outputs the running minimum or maximum value of the corresponding input elements.

Programmatic Use

Block Parameter: Function

Type: character vector

Values: 'min' | 'max'

Default: 'min'

Initial condition — Value to reset output to

0.0 (default) | scalar or vector

Specify the initial condition value. When the reset input signal R is true, the block resets the output to the value you specify.

Programmatic Use

Block Parameter: vinit

Type: character vector

Values: scalar or vector

Default: '0.0'

Block Characteristics

Data Types	Boolean | double | fixed point | integer | single
Direct Feedthrough	no
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

PLC Code Generation
Generate Structured Text code using Simulink® PLC Coder™.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced before R2006a