**Block Category:** Arithmetic

**Inputs:** Real or complex scalars, vectors, or
matrices

**Description:** The gain block multiplies the input
signal by the gain amount. You can enter a value in the dialog box; you can
alternatively double-click the gain block to enter a value.

**Gain:** Indicates the constant multiplier of the input
signal. The default is 1. You can enter a value as a C expression|topic=Entering C expressions,
matrix expression,
or complex number.

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

**1. Gain of a scalar**

Consider the equation *y*(*t*) = 3 sin(*t*),
which can be realized as:

A ramp block is used to access simulation time* t*, a
sin block generates sin(*t*), a gain block amplifies sin(*t*) to 3
sin(*t). *Both sin(*t*) and y(*t*) are shown in plot blocks for
comparison.

**2. Gain of a vector**

Consider the equation:

**z** = 7 **x**

where **x** = [-1 5.6 4]. This equation can
be realized as:

The gain block performs an element-by-element gain operation on the incoming vector.

**3. Gain of a matrix**

Consider the equation:

**Z** = 4.2 **X**

where

This equation can be realized as:

The gain block performs an element-by-element gain operation on the incoming matrix.