Zero Padder (G Dataflow)

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Last Modified: June 25, 2019

Resizes a sequence to the next higher valid power of 2, sets the new trailing elements of the sequence to zero, and leaves the first n elements unchanged, where n is the number of samples in the input sequence.

input array

Input sequence.

If input array is empty, zero padded array is also empty.

This input can be an array of double-precision floating-point numbers or an array of complex double-precision floating-point numbers.

only non-power of 2?

A Boolean that specifies when to zero pad the input sequence.

True	Zero pads input array only if the array size is not a valid power of 2. For example, if input array contains 500 elements, the size of the zero padded output sequence is 512.
False	Resizes input array to the next valid power of 2 even if the array size already is a valid power of 2. For example, if input array contains 1,024 elements, the size of the zero padded output sequence is 2,048.

Default: False

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

zero padded array

The input sequence padded up to the next power of 2 elements.

error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

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.

Benefits of Zero Padding

Zero padding is useful when the size of the acquired data buffers is not a power of 2, and you want to take advantage of fast processing algorithms in the Analysis nodes. These algorithms include Fourier transforms, Power Spectrum, and fast Hartley transforms, which are efficient for buffer sizes that are a power of 2.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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

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