Compare To Zero (Simulink Reference)

Determine how a signal compares to zero

Library

Logic and Bit Operations

Description

The Compare To Zero block compares an input signal to zero. Specify how the input is compared to zero with the Operator parameter. The Operator parameter can have the following values:

== -- Determine whether the input is equal to zero.
~= -- Determine whether the input is not equal to zero.
< -- Determine whether the input is less than zero.
<= -- Determine whether the input is less than or equal to zero.
> -- Determine whether the input is greater than zero.
>= -- Determine whether the input is greater than or equal to zero.

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

Data Type Support

The Compare To Zero block accepts inputs of any data type supported by Simulink, including fixed-point data types. The block output is uint8 or Boolean as specified by the Output data type mode parameter.

For a discussion on the data types supported by Simulink, refer to Data Types Supported by Simulink in the Using Simulink documentation.

Parameters and Dialog Box

Operator: Specify how the input is compared to zero, as discussed in Description.
Output data type mode: Specify the data type of the output, uint8 or Boolean.
Enable zero crossing detection: Select to enable zero-crossing detection. For more information, see Zero Crossing Detection in the Using Simulink documentation.

Characteristics

Direct Feedthrough
Yes

Scalar Expansion
Yes

Zero Crossing
Yes, if enabled.

Direct Feedthrough	Yes
Scalar Expansion	Yes
Zero Crossing	Yes, if enabled.

See Also

Compare To Constant

Compare To Constant Complex to Magnitude-Angle