IfExpressions
This block implements the conditional construct if-then-elseif-...-else-end. One and only one of the output activation ports is fired synchronously when the block is activated.
Library
Activate/ActivationOperations
Description
The IfExpressions block implements the conditional construct if-then-elseif-...-else-end. The if and elseif condition expressions are block parameters. The syntax for their definitions are the same as that used in the MathExpression block, in particular the expressions are expressed in terms of variables u1,...un where ui is the ith entry of the input vector. One and only one of the output activation ports is fired synchronously when the block is activated:
The first output fires if the "if" condition is true. Subsequent outputs correspond to the following "elseif" conditions. The last output corresponds to the "else" condition so it is fired when none of the expressions are strictly larger than zero.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
work | Workspace evaluation | |||
used_names | Used names | Hidden parameter used by the block to indicate used environment variables. | ||
nexx | Number of expressions | Number | ||
Exp |
| Structure | ||
Exp/exx | Expressions | Cell of strings | ||
zc | Apply zero-crossing | Turn this parameter on to detect the zero crossings. Default is off. | Scalar | 0 |
externalActivation | External activation | This parameter specifies whether the block receives an external activation or inherits its activation through its regular input ports. When External Activation is used, an additional activation port is added to the block. Default is OFF. | Scalar | 0 |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
Port 1 | activation | input | externalActivation | |
Port 2 | activation | output | nexx+1 | |
Port 3 | explicit | input | 1 |
Advanced Properties
| Name | Value | Description |
|---|---|---|
always active | no | |
direct-feedthrough | yes | |
zero-crossing | no | |
mode | no | |
continuous-time state | no | |
discrete-time state | no |