**Block Category:** Arithmetic

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

**Description:** The abs block produces the absolute
value of the input signal.

**Label:** Indicates a user-defined block label that appears when
**View > Block Labels** is activated.

**1. Absolute value of a scalar**

Consider the equation *y* = abs (sin*
*(*t*)) realized as:

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] realized as:

When the simulation runs, the abs block computes 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 is realized as:

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