First Order Hold
Linearly extrapolated first-order retention for the input signal.
blockType: First Order Hold
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Path in the library: |
Description
The First Order Hold block generates a continuous piecewise linear approximation of the input signal.
Use block First Order Hold to convert a discrete signal into a continuous signal without additional solver settings.
You can also use block First Order Hold to break algebraic loops in your model.
Ports
Input
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IN_1
—
input signal
scalar | vector | matrix | N-dimensional array
Details
An input signal given as a real scalar, vector or matrix.
| Data types |
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| Complex numbers support |
No |
Output
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OUT_1
—
linearly approximated output signal
scalar | vector | matrix | N-dimensional array
Details
Piecewise linear approximation of the input signal.
| Data types |
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| Complex numbers support |
No |
Parameters
Parameters
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Initial output —
initial value of the output signal
Scalar / array of real numbers
Details
Specify the output value that the unit generates until the simulation time exceeds the first sampling time of the digital input.
The initial output of this block cannot be inf or NaN.
| Default value |
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| Program usage name |
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| Tunable |
Yes |
| Evaluatable |
Yes |
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Output algorithm —
output approximation method
Slow (Avoid Overshoot) | Fast (Minimize Error)
Details
Specify the approximation method used to generate the output signal.
The slow low-frequency algorithm Slow (Avoid Overshoot) avoids the appearance of an output signal that does not match the input signal.
The fast high-frequency algorithm Fast (Minimize Error) minimises the error in the approximated output signal, but may result in an output signal that does not match the input signal.
| Values |
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| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
No |
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Reset if relative extrapolation error exceeds —
permissible error when resetting the solver
Scalar / vector of real numbers
Details
Specify the tolerance level for the extrapolation error of the inference algorithm.
The value of Inf for the parameters Allow continuous input may lead to numerical inaccuracies in the simulation.
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| Default value |
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| Program usage name |
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| Tunable |
Yes |
| Evaluatable |
Yes |
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Allow continuous input —
continuous signal resolution
Logical
Details
Select this parameter to allow the unit to accept continuous signals as input.
Enabling this parameter creates a delay between the input and output continuous signals.
| Enable this parameter if you are using this unit to break algebraic loops. |
| Default value |
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| Program usage name |
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| Tunable |
No |
| Evaluatable |
No |