# Matrix-Vector Product (General) (G Dataflow)

Calculates the product of a general matrix and a vector.  ## operation A

Operation this node performs on A.

Name Value Description
Direct 0 op(A) = A
Conjugated and Transposed 1 op(A) = conjugate transpose of A
Transposed 2 op(A) = transpose of A

Default: Direct ## A

Matrix such that op(A) has dimensions N × M.

This input accepts the following data types:

• 2D array of double-precision, floating-point numbers
• 2D array of complex double-precision, floating-point numbers ## x

Input vector.

x must have at least M elements, where M equals the number of columns in op(A). This node multiplies the first M elements in x by op(A).

This input accepts the following data types:

• 1D array of double-precision, floating-point numbers
• 1D array of complex double-precision, floating-point numbers ## y

Input vector.

y must have at least N elements. If y is an empty vector, this node initializes y to be an N-element vector with all elements set to 0.

This input accepts the following data types:

• 1D array of double-precision, floating-point numbers
• 1D array of complex double-precision, floating-point numbers ## 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 op(A) * x.

This input accepts the following data types:

• Double-precision, floating-point numbers
• Complex double-precision, floating-point numbers

Default: The default value is 1 if alpha is a double-precision, floating-point number. The default value is 1+0i if alpha is a complex double-precision, floating-point number. ## beta

Scalar that scales y.

This input accepts the following data types:

• Double-precision, floating-point numbers
• Complex double-precision, floating-point numbers

Default: The default value is 1 if beta is a double-precision, floating-point number. The default value is 1+0i if beta is a complex double-precision, floating-point number. ## dgemv

Vector of the same size as y.

For the first N elements, this input returns the result of alpha * op(A) * x + beta * y. For any remaining elements, this input returns the value of the element in y with the same index.

This output is available when you wire a 1D array of double-precision, floating-point numbers to x or y, or a 2D array of double-precision, floating-point numbers to A. ## zgemv

Vector of the same size as y.

For the first N elements, this input returns the result of alpha * op(A) * x + beta * y. For any remaining elements, this input returns the value of the element in y with the same index.

This output is available when you wire a 1D array of complex double-precision, floating-point numbers to x or y, or a 2D array of complex double-precision, floating-point numbers to A. ## 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