From 6:00 PM CST Friday, Feb 15th - 2:00 AM CST Sunday, Feb 17th, ni.com will be undergoing system upgrades that may result in temporary service interruption.

We appreciate your patience as we improve our online experience.

# Matrix Update (Hermitian » Rank-2) (G Dataflow)

Calculates the rank-2 update of the upper or lower triangular component of a Hermitian matrix.

## x

N-element vector.

## y

Input vector.

y must be the same size as x.

## A

Hermitian matrix.

A must have dimensions greater than or equal to N × N, where N is the number of elements in x. If A is an empty matrix, this node initializes A to be an N × N matrix with all elements set to 0.

## matrix A type

Triangular component of A that this node uses for the calculation.

Name Value Description
Lower Triangular 2 Uses the lower triangular component of A for the calculation.
Upper Triangular 3 Uses the upper triangular component of A for the calculation.

Default: Upper Triangular

## error in

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.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

## alpha

Scalar that scales x * yH and y * xH, where xH and yH represent conjugate transpose of x and y, respectively.

Default: 1+0i

## zher2

Matrix of the same dimensions as A.

For the elements in the first N rows and N columns of the triangular component you select in matrix A type, zher2 returns the results of alpha * x * yH + alpha * y * xH + A, where xH and yH represent conjugate transpose of x and y, respectively. For any remaining elements, zher2 returns the value of the element in A with the same index.

## error out

Error information.

The node produces this output 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.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application