Statistics

LabVIEW SignalExpress

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Statistics

Performs statistical calculations on time-domain, scalar, or array of scalar data. You can select up to six statistical measurements to perform on your data, and Statistics creates a scalar output for each specified measurement. If the input signal is a waveform, by default Statistics returns a statistical measurement on the current input signal. For scalar data, the Statistics step returns a statistical measurement that represents the entire signal history since you started the project or you reset the step.

ParameterDescription
Input SignalDisplays the input signal. If you wire data to the Express VI and run it, Input Signal displays real data. If you close and reopen the Express VI, Input Signal displays sample data until you run the Express VI again.
  • Displayed signal—Specifies the signal(s) to display in the preview graph(s). This option appears only when you select a group of signals for the input.
    Note  If the input signals include scalar values that depend on the values of input waveform signals, you cannot specify to display all signals in the preview graph(s).
  • Number of points in the data—Specifies the number of points in the data. The default is 4400.
InputContains the following option:
  • Input signal—Specifies the input value.
Configuration And ResultsContains the following options:
  • Max—Specifies to output the maximum value of the current input signal.
  • Min—Specifies to output the minimum value of the current input signal.
  • Mean—Specifies to output the mean value of the current input signal.
  • Nb of samples—Specifies to output the number of input samples the Statistics step performs statistical measurements on.
  • Combine channels—Specifies whether Statistics returns single outputs for measurements on groups of input signals. For example, if you configure Statistics to measure the maximum value of the signals, placing a checkmark in this checkbox returns the maximum value of all the samples of all the channels, instead of one maximum value per channel. This option appears only when Input signal is a group of signals.
  • Standard deviation—Specifies to output the standard deviation of the current input signal.
  • Variance—Specifies to output the variance of the current input signal.
  • Sum—Specifies to output the sum of the current input signal.
  • Measurement duration (s)—Indicates the duration of each measurement the Statistics step is returning.
  • Restart measurement on each iteration—Specifies to restart the statistical measurement on each iteration of the input signal. If you do not select this option, output statistics represent the cumulative values of the entire input signal.
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