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Wave Generator (Formula) (G Dataflow)

Last Modified: January 12, 2018

Generates a signal using a formula.

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offset

DC offset of the signal.

Default: 0

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reset

A Boolean that specifies whether to reset the timestamp of the output signal to zero.

True Sets the timestamp of the output signal to t0 if t0 is available, and resets t in formula to zero.
False Does not set the timestamp of the output signal to t0 if t0 is available, and does not reset t in formula to zero.

Default: False

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amplitude

Amplitude of the signal. The amplitude is also the peak voltage.

Default: 1

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frequency

Frequency of the signal in Hz.

Default: 10

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formula

Representation used to generate the output signal.

The following table lists the defined variable names and their definitions.

f Frequency variable equal to the frequency input
a Amplitude variable equal to the amplitude input
w 2 * pi * f
n Number of samples generated since the last time this node was reset
t Number of elapsed seconds
fs Sampling frequency variable equal to the sample rate input

Default: sin(w*t)*sin(2*pi(1)*t)

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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

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sample rate

Sampling rate in samples per second.

Default: 1000

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samples

Number of samples in the signal.

samples must be greater than 0. Otherwise, this node returns an error.

This input is available when you configure this node to return a waveform or an array of double-precision, floating-point numbers.

Default: 1000

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t0

Timestamp of the output signal. If this input is unwired, this node uses the current time as the timestamp of the output signal.

This input is available only if you configure this node to return a waveform.

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signal

Output signal.

This output can return the following data types:

  • Waveform
  • Double-precision, floating-point number
  • 1D array of double-precision, floating-point numbers
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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


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