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Get XY Value (G Dataflow)

Last Modified: December 18, 2017

Returns the X and Y value of a waveform or digital data set.

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waveform

Waveform from which to retrieve a specified data value (X and Y value).

This input accepts a waveform or a digital waveform.

This input is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this input changes to digital data in.

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digital data

Digital table for which you want to retrieve the X and Y values.

This input is available when you wire a digital table to waveform. If you wire a waveform or digital waveform to digital data, this input changes to waveform.

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Y position format

Data value of the specified element or at a specified time.

This input is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this input changes to start.

Name Value Description
Samples 0 Data value of the specified sample in the waveform data.
Relative Time 1 Data value at a specified time relative to the first point in the waveform.

Default: Samples

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start

Data element or time value where you want to start acquiring X and Y values.

This input is available when you wire a digital table to waveform in. If you wire a waveform or digital waveform to digital data in, this input changes to Y position format.

Default: 0

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Y position

Element number you want from the set of waveform data or the value at a specified time.

For example, if you want the value of the 200th scan, wire 199 to this input. If you want the value at time 100, wire 100 to this input. You specify whether this input operates based on samples or relative time in Y position format.

In Relative Time mode, this node determines whether the value wired to this input is an integer multiple of dt. If the value is not an integer multiple of dt, the node uses the closest exact multiple of dt.

This input is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this input is not available.

Default: 0

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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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X value

Timestamp that captures the X value of the waveform at the location or time you specify.

This output is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this output changes to compressed index.

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compressed index

Index of the data element or time value with respect to the compressed waveform.

For example, if the actual sample number is 8 but the sample is compressed in a portion of the waveform that starts at 3, the compressed index is 3.

This output is available when you wire a digital table to waveform in. If you wire a waveform or digital waveform to digital data in, this output changes to X value.

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actual Y position

Index or time value of the point this node returns.

This output is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this output changes to sample number.

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sample number

Sample number of the data element or time value. If the value of start is inside a compressed portion of the waveform, this node calculates the sample number as if the waveform were not compressed.

This output is available when you wire a digital table to waveform in. If you wire a waveform or digital waveform to digital data out, this output changes to actual Y position.

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Y value

Integer that captures the Y value of the waveform at the location you specify.

This output is an integer array of Y values when you wire a digital waveform to waveform in.

This output is available when you wire a waveform or digital waveform to digital data in. If you wire a digital table to waveform in, this output changes to digital value.

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digital value

Integer array of Y values.

This output is available when you wire a digital table to waveform in. If you wire a waveform or digital waveform to digital data in, this output changes to Y value.

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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.
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waveform data value

Values of the digital waveform data.

This output is available when you wire a digital waveform to waveform in or digital data in. If you wire a digital table to waveform in or digital data in, this output changes to digital data value. If you wire an analog waveform to waveform in or digital data in, this output is not available.

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digital data value

Values of the digital data.

This output is available when you wire a digital table to waveform in. If you wire a digital waveform to waveform in or digital data in, this output changes to digital waveform value. If you wire a waveform to waveform in or digital data in, this output is not available.

Where This Node Can Run:

Desktop OS: Windows

FPGA: This product does not support FPGA devices

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


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