Version:

Last Modified: March 30, 2017

Computes the dot product of two vectors.

A Boolean that specifies whether to reset the internal state of the node.

True | Resets the internal state of the node. |

False | Does not reset the internal state of the node. |

This input is available only if you wire a double-precision, floating-point number or a complex double-precision, floating-point number to **vector x** or **vector y**.

**Default: **False

First input vector.

This input accepts the following data types:

- Double-precision, floating-point number
- Complex double-precision, floating-point number
- 1D array of double-precision, floating-point numbers
- 1D array of complex double-precision, floating-point numbers

When **vector x** is a 1D array of double-precision, floating-point numbers or a 1D array of complex double-precision, floating-point numbers, the number of elements in the first input vector must be greater than 0 and equal to the number of elements in the second input vector. Otherwise, the dot product is undefined, and the node returns NaN.

Second input vector.

This input accepts the following data types:

- Double-precision, floating-point number
- Complex double-precision, floating-point number
- 1D array of double-precision, floating-point numbers
- 1D array of complex double-precision, floating-point numbers

When **vector y** is a 1D array of double-precision, floating-point numbers or a 1D array of complex double-precision, floating-point numbers, the number of elements in the first input vector must be greater than 0 and equal to the number of elements in the second input vector. Otherwise, the dot product is undefined, and the node returns NaN.

Length of each set of data. The node performs computation for each set of data.

This input is available only if you wire a double-precision, floating-point number or a complex double-precision, floating-point number to **vector x** or **vector y**.

Node Behavior with Different **sample length** Values

When you set **sample length** to zero, the node calculates a cumulative solution for the input data from the time the node is called or initialized. When **sample length** is greater than zero, the node calculates the solution for only the newest set of input data.

**Default: **100

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an **error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

**Default: **No error

The dot product.

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

**error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

Let *x* represent the input sequence **vector x** and *y* represent the input sequence **vector y**. This node calculates the output **dot product** using the following equation.

$\text{dot product}=\underset{i=0}{\overset{n-1}{\sum}}{x}_{i}{y}_{i}^{*}$

where *n* is the number of data points and *y*_{i}^{*} is the complex conjugate of *y*_{i}. Notice that the output **dot product** is a scalar value.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: This product does not support FPGA devices