Quantcast

Documentation Center

  • Trial Software
  • Product Updates

Compare To Constant

Determine how signal compares to specified constant

Library

Logic and Bit Operations

Description

The Compare To Constant block compares an input signal to a constant. Specify the constant in the Constant value parameter. Specify how the input is compared to the constant value with the Operator parameter. The Operator parameter can have the following values:

  • == — Determine whether the input is equal to the specified constant.

  • ~= — Determine whether the input is not equal to the specified constant.

  • < — Determine whether the input is less than the specified constant.

  • <= — Determine whether the input is less than or equal to the specified constant.

  • > — Determine whether the input is greater than the specified constant.

  • >= — Determine whether the input is greater than or equal to the specified constant.

The output is 0 if the comparison is false, and 1 if it is true.

Data Type Support

The Compare To Constant block accepts inputs of any data type that Simulink® supports, including fixed-point and enumerated data types. The block first converts its Constant value parameter to the input data type, and then performs the specified operation. The block output is uint8 or boolean as specified by the Output data type parameter.

For more information, see Data Types Supported by Simulink in the Simulink documentation.

Parameters and Dialog Box

Operator

Specify how the input is compared to the constant value, as discussed in Description.

Constant value

Specify the constant value to which the input is compared.

Output data type

Specify the data type of the output, boolean or uint8.

Enable zero-crossing detection

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

Characteristics

Direct Feedthrough

Yes

Scalar Expansion

Yes

Multidimensionalized

Yes

Zero-Crossing Detection

Yes, if enabled.

Was this topic helpful?