Simulink Reference

Math Function

Perform a mathematical function

Library

Math Operations

Description

The Math Function block performs numerous common mathematical functions.

You can select one of these functions from the Function list: exp, log, 10u, log10, magnitude2, square, sqrt, pow, conj, reciprocal, hypot, rem, mod, transpose, and hermitian. The block output is the result of the operation of the function on the input or inputs.

The name of the function appears on the block icon. Simulink automatically draws the appropriate number of input ports.

Use the Math Function block instead of the Fcn block when you want vector or matrix output, because the Fcn block can produce only scalar output.

Data Type Support

A Math Function block accepts complex or real-valued signals or signal vectors of type double. The output signal type is real or complex, depending on the setting of the Output signal type parameter.

Parameters and Dialog Box

Function

The mathematical function.

Output signal type

The dialog allows you to select the output signal type of the Math Function block as real, complex, or auto.

	Input	Output Signal Type
Function	Signal	Auto	Real	Complex
Exp, log, 10u, log10, square, sqrt, pow, reciprocal, conjugate, transpose, hermitian	real complex	real complex	real error	complex complex
magnitude squared	real complex	real real	real real	complex complex
hypot, rem, mod	real complex	real error	real error	complex error

Characteristics

Direct Feedthrough	Yes
Sample Time	Inherited from driving block
Scalar Expansion	Of the input when the function requires two inputs
Dimensionalized	Yes
Zero Crossing	No

Manual Switch

MATLAB Fcn