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freq info specifies the frequency information for the data plot.
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start frequency specifies the start frequency of the data plot. The value of start frequency must be in a normalized frequency range of 0–0.5 times the real sampling rate.
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end frequency specifies the end frequency of the data plot. The value of end frequency must be in a normalized frequency range of 0–0.5 times the real sampling rate and greater than the value of start frequency.
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num of freq bins specifies the number of frequency bins between start frequency and end frequency for the data plot.
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interval type determines how the frequency points of the FRF increase from start frequency to end frequency. For a logarithmic interval type, the frequency points are the following:
f0, f0*df, f0*(df)2, f0*(df)3, ..., fFinal
| where | f0 = start frequency |
| fFinal = end frequency |
| df = (log10(end frequency) – log10(start frequency)) / (num of freq bins – 1) |
For a linear interval type, the frequency points are the following:
f0, f0+df, f0+2df, f0+3df, ..., fFinal
| where | f0 = start frequency |
| fFinal = end frequency |
| df = (end frequency – start frequency) / (num of freq bins – 1) |
| 0 | logarithmic (default) | | 1 | linear |
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system model contains information about the model structure, nominal or estimated parameters, identification result, and so on. Use the Model Management VIs to retrieve the information system model contains.  | Note You can use a customized system model probe to view model information that flows through system model wires when you debug a block diagram created with the System Identification VIs. Right-click a system model wire and select Custom Probe»SI System Model from the shortcut menu to use the system model probe. |
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channel selects the signal pair with which to compute the transfer function.
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type specifies whether to compute the transfer function between a stimulus signal and a response signal or the transfer function between a noise signal and a response signal.
| 0 | stimulus (default)—Computes the transfer function between a stimulus signal and a response signal. Use input index and output index to select the stimulus and response signals to use. | | 1 | noise—Computes the transfer function between a noise signal and a response signal. Use input index and output index to select the noise and response signals to use. |
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input index specifies the index of the system input channel with which to compute the transfer function. input index applies only for MISO or MIMO system models.
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output index specifies the index of the system output channel with which to compute the transfer function. output index applies only for MIMO system models.
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confidence level (%) specifies the percentage confidence interval for the FRF.
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error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
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magnitude unit specifies the type of scaling to use for the magnitude axis, or the y-axis.
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show confidence range? specifies whether to show the confidence range of the plot data. The default is TRUE.
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Bode magnitude plot returns the Bode magnitude plot of the input signal. Bode magnitude plot is a plot on an XY graph that shows the linear or decibel magnitude of the given model plotted against a set of frequencies. Use the SI Bode Plot Indicator to display the Bode magnitude plot.
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frequency returns the frequency points for the Bode magnitude plot.
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magnitude returns the magnitude values of corresponding frequency points.
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Bode phase plot returns the Bode phase plot of the input signal. Bode phase plot is a plot on an XY graph that shows the phase, in degrees, of the model plotted against a set of frequency values. Use the SI Bode Plot Indicator to display the Bode phase plot.
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frequency returns the frequency points for the Bode phase plot.
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phase returns the phase values of corresponding frequency points.
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error out contains error information. This output provides standard error out functionality.
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