Dot Product (Simulink Reference)

Generate the dot product

Library

Math Operations

Description

The Dot Product block generates the dot product of its two input vectors. The scalar output, y, is equal to the MATLAB operation

```
y = sum(conj(u1) .* u2 )
```

where u1 and u2 represent the vector inputs. If both inputs are vectors, they must be the same length. The elements of the input vectors can be real- or complex-valued signals. The signal type (complex or real) of the output depends on the signal types of the inputs.

Input 1
Input 2
Output

real
real
real

real
complex
complex

complex
real
complex

complex
complex
complex

Input 1	Input 2	Output
real	real	real
real	complex	complex
complex	real	complex
complex	complex	complex

To perform element-by-element multiplication without summing, use the Product block.

Data Type Support

The Dot Product block accepts and outputs signals of any data type supported by Simulink, including fixed-point data types.

For a discussion on the data types supported by Simulink, refer to Data Types Supported by Simulink in the Using Simulink documentation.

Parameters and Dialog Box

Require all inputs to have same data type: Select to require all inputs to have the same data type.
Output data type mode: Set the data type and scaling of the output to be the same as that of the first input, or to be inherited via an internal rule or by backpropagation. Alternatively, choose to specify the data type and scaling of the output through the Output data type and Output scaling value parameters.
Output data type: Set the output data type. This parameter is only visible if you select Specify via dialog for the Output data type mode parameter.
Output scaling: Set the output scaling using either binary point-only or [Slope Bias] scaling. This parameter is only visible if you select Specify via dialog for the Output data type and scaling parameter.
Lock output scaling against changes by the autoscaling tool: Select to lock scaling of outputs. This parameter is only visible if you select Specify via dialog for the Output data type mode parameter.
Round integer calculations toward: Select the rounding mode for fixed-point operations.
Saturate on integer overflow: Select to have overflows saturate.

Characteristics

Direct Feedthrough
Yes

Sample Time
Inherited from driving block

Scalar Expansion
No

States
0

Dimensionalized
Yes

Zero Crossing
No

Direct Feedthrough	Yes
Sample Time	Inherited from driving block
Scalar Expansion	No
States	0
Dimensionalized	Yes
Zero Crossing	No

DocBlock GEmbedded MATLAB Function