LookupTable
This block approximates a non-linear function using interpolation on data provided as a "1D-table".
Library
LookupTables
Description
The LookupTable block approximates a non-linear function using interpolation on data provided as a "table". This is one dimensional and the table is then defined by specifying two vectors (X and Y) of size n, with x monotonic. Output of the block is the approximation of the block input using the selected interpolation method.
If Y is a matrix, then the input should be a scalar. In this case, Y and the output have the same row size.
If Y is a vector, then the input can be scalar, vector or matrix. In this case, input and the output have the same size.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
xx | X | X values. Vector of doubles of size n (same size as vector Y). The X data vector must be strictly monotonically increasing. It can be either row or column provided Y is the same size. | Vector | |
yy | Y | Y values. Vector of doubles of size n (same size as vector X). When X is a row vector, Y can be a matrix with the same number of columns. | Matrix | |
Method | Interpolation method | Interpolation method, to be selected amongst: ZeroOrder(Floor), ZeroOrder(Ceil), ZeroOrder(Nearest), Linear, Not a Knot, Natural, Clamped. | String | 'ZeroOrder(floor)' |
typ | Output datatype | Defines the datatype of the output of the block. Available datatypes are: double, int32, int16, int8, unit32, uint16, uint8. | String | 'double' |
EventGen | Apply zero crossings | Enable this parameter to detect the zero crossings. Default is on. | Scalar | 0 |
externalActivation | External activation | Specifies whether the block receives an external activation or inherits its activation through its regular input ports. When External Activation is selected, an additional activation port is added to the block. By default, external activation is not selected. | Number | 0 |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
Leftside | Behavior on the left-hand side of the X data span | Action that should be taken on the left-hand side of the X data. | String | 'Zero' |
Rightside | Behavior on the right-hand side of the X data span | Action that should be taken on the right-hand side of the X data. | String | 'Zero' |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
Port 1 | explicit | output | 1 | |
Port 2 | explicit | input | 1 | |
Port 3 | activation | input | externalActivation |
Advanced Properties
| Name | Value | Description |
|---|---|---|
always active | no | |
direct-feedthrough | yes | |
zero-crossing | no | |
mode | no | |
continuous-time state | no | |
discrete-time state | no |