Using Simulink

Relational Operator

Perform the specified relational operation on the input.

Library

Math

Description

The Relational Operator block performs a relational operation on its two inputs and produces output according to the following table.

Operator	Output
==	TRUE if the first input is equal to the second input
~=	TRUE if the first input is not equal to the second input
<	TRUE if the first input is less than the second input
<=	TRUE if the first input is less than or equal to the second input
>=	TRUE if the first input is greater than or equal to the second input
>	TRUE if the first input is greater than the second input

If the result is TRUE, the output is 1; if FALSE, it is 0. You can specify inputs as scalars, arrays, or a combination of a scalar and an array:

• For scalar inputs, the output is a scalar.
• For array inputs, the output is an array of the same dimensions, where each element is the result of an element-by-element comparison of the input arrays.
• For mixed scalar/array inputs, the output is an array, where each element is the result of a comparison between the scalar and the corresponding array element.

The block icon displays the selected operator.

Data and Numeric Type Support

A Relational Operator block accepts real or complex signals of any data type. Both inputs must be of the same data type. One input may be real and the other complex, if the operator is == or !=. The block outputs a signal of type boolean, if Boolean logic signals are enabled (see Enabling Strict Boolean Type Checking). Otherwise, the block outputs a signal of type double.

Parameters and Dialog Box

Operator

The relational operator to be applied to the block inputs.

Characteristics

Direct Feedthrough	Yes
Sample Time	Inherited from driving block
Scalar Expansion	Of inputs
Dimensionalized	Yes
Zero Crossing	Yes, to detect when the output changes

Real-Imag to Complex

Relay