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Owning Palette: Waveform VIs and Functions
Requires: Base Development System
Retrieves a subset of a waveform at a specified time or index. You must manually select the polymorphic instance you want to use.
Use the pull-down menu to select an instance of this VI.
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | open interval? defines whether the waveform subset extracted is an open or closed interval. The default is TRUE, which selects an open interval. For example, if t0 = 0, dt = 1, Y = {0, 1, 2}, start/duration format is Relative Time, start samples/time is 0, and duration is 2, an open interval returns {0, 1}. A closed interval returns {0, 1, 2}. | ||||
![]() | start/duration format specifies if you want to retrieve the data value of the specified element or at a specified time.
| ||||
![]() | waveform in is the digital waveform for which you want to retrieve a subset. | ||||
![]() | start samples/time is the data element or time value where you want to start acquiring a waveform subset. | ||||
![]() | duration is the amount of time to retrieve data or the number of elements of data you want to retrieve, depending on the start/duration format you select. | ||||
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. | ||||
![]() | waveform out is the waveform subset. | ||||
![]() | actual start samples/time is the actual data element when the subset was acquired. | ||||
![]() | actual duration is the actual number of elements retrieved or the actual amount of time the data values were acquired. | ||||
![]() | error out contains error information. This output provides standard error out functionality. |
![]() | digital data is the set of digital data for which you want to retrieve a subset. |
![]() | start is the data element or time value where you want to start acquiring a data subset. |
![]() | number of samples specifies the number of samples to include in digital data subset. |
![]() | error in describes error conditions that occur before this node runs. This input provides standard error in functionality. |
![]() | digital data subset is the digital data subset. |
![]() | error out contains error information. This output provides standard error out functionality. |
For example, consider a waveform of 128 scans with a dt of 1.00. If you wire 40.00 to duration and 25.00 to start samples/time, the actual duration and actual start samples/time are the same, 40.00 and 25.00, respectively. However, if the waveform has a dt of 2.00, the actual duration and the actual start samples/time are 40.00 and 24.00, respectively.
Refer to the Waveform - Get Subset VI in the labview\examples\Waveform directory for an example of using the Get Waveform Subset VI.
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