**Block Inputs:** Real, complex, or fixed-point scalars,
or vectors or matrices.

The abs block produces the absolute value of the input signal.

**Label:** Indicates a user-defined block label.

**1. Absolute
value of a scalar**

Consider the equation *y* = abs (sin*
*(*t*)), which can be realized as shown below.

The results in the two plot blocks show that the abs block computes the absolute value of the input signal.

**2. Absolute
value of a vector**

Consider the equation:

**w** = abs (**x**)

where **x** = [-7 1 -2.2]. This equation can be realized
as:

When the simulation runs, the abs block computes and
outputs an element-by-element absolute value of the vector **x**.

**3. Absolute
value of a matrix**

Consider the equation:

**Z** = abs(**Q**)

where

This equation can be realized as shown below.

Four const blocks provide the vector element
values of **Q** through a scalarToVector block. When the simulation runs, the
abs block computes the element-by-element absolute value of the incoming matrix.