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See the recommended documentation of this function
EXPRESSION
Mathematical expression
Block Screenshot
Description
The Expression block applies the specified Scilab expressions to its input.
Parameters
number of inputs
Block input can be a scalar or vector.
Properties : Type 'vec' of size 1
scilab expression
The Scilab expression applied to the input.
Properties : Type 'vec' of size 1
All Scilab operators are supported.
Only a restricted list of functions are supported in the expression.
Name #rhs sin 1 cos 1 tan 1 asin 1 acos 1 atan 1 atan2 2 Name #rhs sinh 1 cosh 1 tanh 1 asinh 1 acosh 1 atanh 1 Name #rhs exp 1 log 1 log10 1 int 1 round 1 ceil 1 floor 1 Name #rhs sign 1 abs 1 min 2 max 2 In the provided expression, any subexpression being an exponent more than 1-character long must end with a space, to be correctly displayed on the block's icon. This constrain has no consequence on the computational validity of the expression. Examples: "u1^12-u2", "u1^ 12-u2", "u1^abc - 3", "u1^(u2-3) + 4" will be correctly displayed, while "u1^abc-3" would be displayed as "u1^{abc-3}" (but well computed asu1^abc + 3
) and "u1^(u2-3)+4" as "u1^{(u2-3)+4}" instead of "u1^{(u2-3)} + 4". "u1^abc - 3" and "u1^(u2-3) + 4" will have to be entered instead.use zero-crossing
Select to enable zero crossing detection.
Properties : Type 'vec' of size 1
Default properties
always active: no
direct-feedthrough: yes
zero-crossing: yes
mode: yes
regular inputs:
- port 1 : size [1,1] / type 1
- port 2 : size [1,1] / type 1
regular outputs:
- port 1 : size [1,1] / type 1
number/sizes of activation inputs: 0
number/sizes of activation outputs: 0
continuous-time state: no
discrete-time state: no
object discrete-time state: no
name of computational function: evaluate_expr
Example
The following example calculate an arbitrary expression with multiple different configuration or blocks.
y = u(1) - u(2) - u(3)
Interfacing function
SCI/modules/scicos_blocks/macros/NonLinear/EXPRESSION.sci
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