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MinMax

Output minimum or maximum input value

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  • Library:

  • Simulink / Math Operations

    HDL Coder / Math Operations

  • MinMax block

Description

The MinMax block outputs either the minimum or the maximum element or elements of the inputs. You choose whether the block outputs the minimum or maximum values by setting theFunctionparameter.

The MinMax block ignores any input value that isNaN, except when every input value isNaN. When all input values areNaN, the output isNaN, either as a scalar or the value of each output vector element.

Ports

Input

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Provide an input signal from which the block outputs the maximum or minimum values.

  • When the block has one input port, the input must be a scalar or a vector. The block outputs a scalar equal to the minimum or maximum element of the input vector.

  • When the block has multiple input ports, all nonscalar inputs must have the same dimensions. The block expands any scalar inputs to have the same dimensions as the nonscalar inputs. The block outputs a signal having the same dimensions as the input. Each output element equals the minimum or maximum of the corresponding input elements.

Dependencies

To support matrix input, you must set theNumber of input portsparameter to an integer greater than one. All nonscalar inputs must have the same dimensions.

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

Provide an input signal from which the block outputs the maximum or minimum values.

When the block has multiple input ports, all nonscalar inputs must have the same dimensions. The block expands any scalar inputs to have the same dimensions as the nonscalar inputs. The block outputs a signal having the same dimensions as the input. Each output element equals the minimum or maximum of the corresponding input elements.

Dependencies

To provide more than one input signal, set theNumber of input portsto an integer greater than 1.

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

Output

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When the block has one input, the output is a scalar value, equal to the minimum or maximum of the input elements. When the block has multiple inputs, the output is a signal having the same dimensions as the input. Each output element equals the minimum or maximum of the corresponding input elements.

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

Parameters

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Main

Specify whether to apply the functionminormaxto the input.

Programmatic Use

Block Parameter:Function
Type:character vector
Values:'min' | 'max'
Default:'min'

Specify the number of inputs to the block.

Programmatic Use

Block Parameter:Inputs
Type:character vector
Values:positive integer
Default:'1'

Select to enable zero-crossing detection. For more information, seeZero-Crossing Detection.

Programmatic Use

Block Parameter:ZeroCross
Type: character vector, string
Values:'off'|'on'
Default:'on'

Specify the sample time as a value other than-1. For more information, seeSpecify Sample Time.

Dependencies

This parameter is not visible unless it is explicitly set to a value other than-1. To learn more, seeBlocks for Which Sample Time Is Not Recommended.

Programmatic Use

Block Parameter:SampleTime
Type:string scalar or character vector
Default:"-1"

Signal Attributes

Select this check box to require that all inputs have the same data type.

Programmatic Use

Block Parameter:InputSameDT
Type:character vector
Values:'off' | 'on'
Default:'off'

Lower value of the output range that Simulink®checks.

Simulink uses the minimum to perform:

Note

Output minimumdoes not saturate or clip the actual output signal. Use theSaturationblock instead.

Programmatic Use

Block Parameter:OutMin
Type: character vector
Values:'[ ]'| scalar
Default:'[ ]'

Upper value of the output range that Simulink checks.

Simulink uses the maximum value to perform:

Note

Output maximumdoes not saturate or clip the actual output signal. Use theSaturationblock instead.

Programmatic Use

Block Parameter:OutMax
Type: character vector
Values:'[ ]'| scalar
Default:'[ ]'

Choose the data type for the output. The type can be inherited, specified directly, or expressed as a data type object such asSimulink.NumericType.

Click theShow data type assistantbuttonto display theData Type Assistant, which helps you set the data type attributes. For more information, seeSpecify Data Types Using Data Type Assistant.

Dependencies

When input is a floating-point data type smaller than single precision, the继承:Inherit via internal ruleoutput data type depends on the setting of theInherit floating-point output type smaller than single precisionconfiguration parameter. Data types are smaller than single precision when the number of bits needed to encode the data type is less than the 32 bits needed to encode the single-precision data type. For example,halfandint16are smaller than single precision.

Programmatic Use

Block Parameter:OutDataTypeStr
Type: character vector
Values:'Inherit: Inherit via internal rule'|'Inherit: Inherit via back propagation'|'Inherit: Same as first input'|'single'|'half'|'int8'|'uint8'|'int16'|'uint16'|'int32'|'uint32'|'int64'|'uint64'|'fixdt(1,16,0)'|'fixdt(1,16,2^0,0)'|''
Default:'Inherit: Inherit via internal rule'

Select this parameter to prevent the fixed-point tools from overriding theOutputdata type you specify on the block. For more information, seeUse Lock Output Data Type Setting(Fixed-Point Designer).

Programmatic Use

Block Parameter:LockScale
Type:character vector
Values:'off' | 'on'
Default:'off'

Specify the rounding mode for fixed-point operations. For more information, seeRounding(Fixed-Point Designer).

Block parameters always round to the nearest representable value. To control the rounding of a block parameter, enter an expression using a MATLAB®rounding function into the mask field.

Programmatic Use

Block Parameter:RndMeth
Type:character vector
Values:'Ceiling' | 'Convergent' | 'Floor' | 'Nearest' | 'Round' | 'Simplest' | 'Zero'
Default:'Floor'

Specify whether overflows saturate or wrap.

Action Rationale Impact on Overflows Example

Select this check box (on).

Your model has possible overflow, and you want explicit saturation protection in the generated code.

Overflows saturate to either the minimum or maximum value that the data type can represent.

The maximum value that theint8(签署了8位整数)数据类型可以表示127. Any block operation result greater than this maximum value causes overflow of the 8-bit integer. With the check box selected, the block output saturates at 127. Similarly, the block output saturates at a minimum output value of -128.

Do not select this check box (off).

You want to optimize efficiency of your generated code.

You want to avoid overspecifying how a block handles out-of-range signals. For more information, seeTroubleshoot Signal Range Errors.

Overflows wrap to the appropriate value that is representable by the data type.

The maximum value that theint8(签署了8位整数)数据类型可以表示127. Any block operation result greater than this maximum value causes overflow of the 8-bit integer. With the check box cleared, the software interprets the overflow-causing value asint8, which can produce an unintended result. For example, a block result of 130 (binary 1000 0010) expressed asint8, is -126.

When you select this check box, saturation applies to every internal operation on the block, not just the output, or result. Usually, the code generation process can detect when overflow is not possible. In this case, the code generator does not produce saturation code.

Programmatic Use

Block Parameter:SaturateOnIntegerOverflow
Type:character vector
Values:'off' | 'on'
Default:'off'

Model Examples

Find Maximum Value of Input

Find Maximum Value of Input

Use the MinMax block to output the maximum value of two sine waves.
Open Model
Modeling a Fault-Tolerant Fuel Control System

Modeling a Fault-Tolerant Fuel Control System

Combine Stateflow® with Simulink® to efficiently model hybrid systems. This type of modeling is particularly useful for systems that have numerous possible operational modes based on discrete events. Traditional signal flow is handled in Simulink while changes in control configuration are implemented in Stateflow. The model described below represents a fuel control system for a gasoline engine. The system is highly robust in that individual sensor failures are detected and the control system is dynamically reconfigured for uninterrupted operation.
Open Model

Block Characteristics

Data Types

Boolean|double|fixed point|half|integer|single

Direct Feedthrough

yes

Multidimensional Signals

yes

Variable-Size Signals

yes

Zero-Crossing Detection

yes

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

See Also